diff --git a/src/main/browser/agent-browser-bridge-state-commands.ts b/src/main/browser/agent-browser-bridge-state-commands.ts
index 4e03055da57..779c6930887 100644
--- a/src/main/browser/agent-browser-bridge-state-commands.ts
+++ b/src/main/browser/agent-browser-bridge-state-commands.ts
@@ -15,6 +15,7 @@ import type {
 import { BrowserError } from './cdp-bridge'
 import { parseShellArgs, stripAgentBrowserTargetArgs } from './agent-browser-bridge-process'
 import { AgentBrowserBridgeInteractionCommands } from './agent-browser-bridge-interaction-commands'
+import { sendGuestCdpCommand } from './guest-cdp-command'
 
 export abstract class AgentBrowserBridgeStateCommands extends AgentBrowserBridgeInteractionCommands {
   // ── Cookie commands ──
@@ -101,16 +102,14 @@ export abstract class AgentBrowserBridgeStateCommands extends AgentBrowserBridge
       }
 
       // Why: agent-browser's `set viewport` has no `mobile` flag, so apply the emulation directly via CDP to honor Orca's --mobile.
-      await dbg.sendCommand('Emulation.setDeviceMetricsOverride', {
+      await sendGuestCdpCommand(wc, 'Emulation.setDeviceMetricsOverride', {
         width,
         height,
         deviceScaleFactor: scale,
         mobile
       })
       // Why: BrowserView's compositor can keep the old host size after a metrics-only resize, cropping remote screencast clients.
-      await Promise.resolve(dbg.sendCommand('Emulation.setVisibleSize', { width, height })).catch(
-        () => {}
-      )
+      await sendGuestCdpCommand(wc, 'Emulation.setVisibleSize', { width, height }).catch(() => {})
 
       return {
         width,
diff --git a/src/main/browser/agent-browser-bridge-test-harness.ts b/src/main/browser/agent-browser-bridge-test-harness.ts
index c4c28006e82..34e381838b2 100644
--- a/src/main/browser/agent-browser-bridge-test-harness.ts
+++ b/src/main/browser/agent-browser-bridge-test-harness.ts
@@ -56,6 +56,7 @@ export type MockWebContents = {
   on: Mock<(event: string, listener: MockEmitterListener) => void>
   removeListener: Mock<(event: string, listener: MockEmitterListener) => void>
   isDestroyed: () => boolean
+  isCrashed: () => boolean
   invalidate: Mock<() => void>
   focus: Mock<() => void>
   debugger: MockWebContentsDebugger
@@ -78,6 +79,7 @@ export function mockWebContents(
     on: vi.fn(),
     removeListener: vi.fn(),
     isDestroyed: () => false,
+    isCrashed: () => false,
     invalidate: vi.fn(),
     focus: vi.fn(),
     debugger: {
diff --git a/src/main/browser/browser-manager-viewport-crashed-guest.test.ts b/src/main/browser/browser-manager-viewport-crashed-guest.test.ts
new file mode 100644
index 00000000000..696be1a474b
--- /dev/null
+++ b/src/main/browser/browser-manager-viewport-crashed-guest.test.ts
@@ -0,0 +1,80 @@
+import { beforeEach, describe, expect, it, vi } from 'vitest'
+
+const mocks = vi.hoisted(() => ({
+  appGetPathMock: vi.fn(() => '/downloads'),
+  shellOpenExternalMock: vi.fn(),
+  browserWindowFromWebContentsMock: vi.fn(),
+  menuBuildFromTemplateMock: vi.fn(),
+  guestOffMock: vi.fn(),
+  guestOnMock: vi.fn(),
+  guestSetBackgroundThrottlingMock: vi.fn(),
+  guestSetWindowOpenHandlerMock: vi.fn(),
+  guestOpenDevToolsMock: vi.fn(),
+  webContentsFromIdMock: vi.fn(),
+  screenGetCursorScreenPointMock: vi.fn(() => ({ x: 0, y: 0 })),
+  openPopupWithOriginBarMock: vi.fn(),
+  processUserAgent:
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36'
+}))
+
+vi.mock('electron', () => ({
+  app: { getPath: mocks.appGetPathMock },
+  BrowserWindow: { fromWebContents: mocks.browserWindowFromWebContentsMock },
+  clipboard: { writeText: vi.fn() },
+  shell: { openExternal: mocks.shellOpenExternalMock },
+  Menu: { buildFromTemplate: mocks.menuBuildFromTemplateMock },
+  screen: { getCursorScreenPoint: mocks.screenGetCursorScreenPointMock },
+  webContents: { fromId: mocks.webContentsFromIdMock }
+}))
+vi.mock('./popup-origin-bar-window', () => ({
+  openPopupWithOriginBar: mocks.openPopupWithOriginBarMock
+}))
+vi.mock('./browser-process-user-agent', () => ({
+  getBrowserProcessUserAgentIdentity: () => ({ mode: 'clean', userAgent: mocks.processUserAgent })
+}))
+
+import { browserManager } from './browser-manager'
+import {
+  rendererWebContentsId,
+  resetBrowserManagerMocks,
+  resetBrowserManagerState
+} from './browser-manager-test-harness'
+import { createViewportGuestFactory } from './browser-manager-viewport-test-fixtures'
+
+const makeGuest = createViewportGuestFactory(mocks)
+const PHONE = { width: 375, height: 667, deviceScaleFactor: 2, mobile: true } as const
+
+const metricsWrites = (sendCommand: ReturnType<typeof vi.fn>): unknown[][] =>
+  sendCommand.mock.calls.filter(([method]) => method === 'Emulation.setDeviceMetricsOverride')
+
+describe('browserManager viewport on a guest whose renderer crashed', () => {
+  beforeEach(() => {
+    resetBrowserManagerMocks(mocks)
+    resetBrowserManagerState()
+    vi.spyOn(console, 'warn').mockImplementation(() => {})
+  })
+
+  it('never resizes the dead guest, and applies the preset once the page reloads', async () => {
+    const { guest, debuggerSendCommand, setRendererCrashed } = makeGuest(42501)
+    mocks.webContentsFromIdMock.mockReturnValue(guest)
+    // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: the viewport fixture implements every WebContents member these paths touch.
+    browserManager.attachGuestPolicies(guest as never)
+    browserManager.registerGuest({
+      browserPageId: 'tab-crashed',
+      webContentsId: 42501,
+      rendererWebContentsId
+    })
+
+    // Chromium would segfault the main process on this write (its view is gone with the renderer).
+    setRendererCrashed(true)
+    await expect(browserManager.setViewportOverride('tab-crashed', PHONE)).resolves.toBe(false)
+    expect(metricsWrites(debuggerSendCommand)).toEqual([])
+
+    // The reloaded page's dom-ready reapplies the store's preset.
+    setRendererCrashed(false)
+    await expect(browserManager.setViewportOverride('tab-crashed', PHONE)).resolves.toBe(true)
+    expect(metricsWrites(debuggerSendCommand)).toEqual([
+      ['Emulation.setDeviceMetricsOverride', PHONE]
+    ])
+  })
+})
diff --git a/src/main/browser/browser-manager-viewport-test-fixtures.ts b/src/main/browser/browser-manager-viewport-test-fixtures.ts
index 959e958491c..805988e7702 100644
--- a/src/main/browser/browser-manager-viewport-test-fixtures.ts
+++ b/src/main/browser/browser-manager-viewport-test-fixtures.ts
@@ -35,6 +35,8 @@ export type ViewportGuestHandle = {
   debuggerSendCommand: ReturnType<typeof vi.fn>
   debuggerIsAttached: ReturnType<typeof vi.fn>
   debuggerAttach: ReturnType<typeof vi.fn>
+  /** Flips what isCrashed() reports, as a renderer death and its reload do. */
+  setRendererCrashed: (crashed: boolean) => void
   setGuestUserAgent: (ua: string) => void
   commitNavigationTo: (nextUrl: string) => void
   webContentsUserAgent: () => string
@@ -55,6 +57,7 @@ export function createViewportGuestFactory(
     const debuggerIsAttached = vi.fn(() => true)
     const debuggerAttach = vi.fn()
     let currentUa = mocks.processUserAgent ?? GUEST_ELECTRON_UA
+    let rendererCrashed = false
     // Why: getURL() reports the last COMMITTED url — it does not move at did-start-navigation.
     let committedUrl = url
     // Chromium applies CDP commands in issue order, so a later-issued write wins however they settle,
@@ -81,6 +84,7 @@ export function createViewportGuestFactory(
     const guest = {
       id,
       isDestroyed: vi.fn(() => false),
+      isCrashed: vi.fn(() => rendererCrashed),
       getType: vi.fn(() => 'webview'),
       getURL: vi.fn(() => committedUrl),
       getUserAgent: vi.fn(() => currentUa),
@@ -107,6 +111,9 @@ export function createViewportGuestFactory(
       debuggerSendCommand,
       debuggerIsAttached,
       debuggerAttach,
+      setRendererCrashed: (crashed: boolean) => {
+        rendererCrashed = crashed
+      },
       setGuestUserAgent: (ua: string) => {
         currentUa = ua
       },
diff --git a/src/main/browser/browser-manager-viewport.ts b/src/main/browser/browser-manager-viewport.ts
index 98dff80fabb..64e50e5ea48 100644
--- a/src/main/browser/browser-manager-viewport.ts
+++ b/src/main/browser/browser-manager-viewport.ts
@@ -6,6 +6,7 @@ import {
 } from '../../shared/browser-annotation-viewport-bridge'
 import type { BrowserViewportOverride } from '../../shared/browser-workspace-types'
 import { BrowserManagerDownloadLifecycle } from './browser-manager-download-lifecycle'
+import { sendGuestCdpCommand } from './guest-cdp-command'
 
 // Why no maxTouchPoints: Chromium rejects values outside 1..16 even when disabling, which left
 // touch emulation (and no-hover media features) on after leaving a mobile preset (#22749).
@@ -155,7 +156,7 @@ export abstract class BrowserManagerViewport extends BrowserManagerDownloadLifec
       'device metrics',
       () =>
         override
-          ? dbg.sendCommand('Emulation.setDeviceMetricsOverride', {
+          ? sendGuestCdpCommand(guest, 'Emulation.setDeviceMetricsOverride', {
               width: override.width,
               height: override.height,
               deviceScaleFactor: override.deviceScaleFactor,
diff --git a/src/main/browser/browser-screencast-debugger-command.ts b/src/main/browser/browser-screencast-debugger-command.ts
index 3a607e416ec..b32eef8d308 100644
--- a/src/main/browser/browser-screencast-debugger-command.ts
+++ b/src/main/browser/browser-screencast-debugger-command.ts
@@ -2,15 +2,22 @@ import type { WebContents } from 'electron'
 
 const DEBUGGER_COMMAND_TIMEOUT_MS = 8_000
 
-export async function sendDebuggerCommand(
+export function sendDebuggerCommand(
   dbg: WebContents['debugger'],
   method: string,
   params: Record<string, unknown> = {}
+): Promise<unknown> {
+  return runDebuggerCommandWithTimeout(method, () => dbg.sendCommand(method, params))
+}
+
+export async function runDebuggerCommandWithTimeout(
+  method: string,
+  send: () => Promise<unknown>
 ): Promise<unknown> {
   let timeout: ReturnType<typeof setTimeout> | null = null
   try {
     return await Promise.race([
-      Promise.resolve().then(() => dbg.sendCommand(method, params)),
+      Promise.resolve().then(send),
       new Promise<never>((_, reject) => {
         timeout = setTimeout(() => {
           reject(new Error(`Timed out while running ${method}.`))
diff --git a/src/main/browser/browser-screencast-device-metrics.ts b/src/main/browser/browser-screencast-device-metrics.ts
index ff805d14604..96037bd53ae 100644
--- a/src/main/browser/browser-screencast-device-metrics.ts
+++ b/src/main/browser/browser-screencast-device-metrics.ts
@@ -1,5 +1,9 @@
 import type { Debugger, WebContents } from 'electron'
-import { sendDebuggerCommand } from './browser-screencast-debugger-command'
+import {
+  runDebuggerCommandWithTimeout,
+  sendDebuggerCommand
+} from './browser-screencast-debugger-command'
+import { sendGuestCdpCommand } from './guest-cdp-command'
 import type { BrowserScreencastOptions } from './browser-screencast-stream-types'
 import { positiveInteger, positiveNumber } from './browser-screencast-viewport-fit'
 
@@ -15,6 +19,8 @@ export function createBrowserScreencastDeviceMetrics(
   options: BrowserScreencastOptions
 ): BrowserScreencastDeviceMetrics {
   let deviceMetricsOverridden = false
+  const sendViewportCommand = (method: string, params: Record<string, unknown>): Promise<unknown> =>
+    runDebuggerCommandWithTimeout(method, () => sendGuestCdpCommand(webContents, method, params))
 
   const clearDeviceMetricsOverride = async (): Promise<void> => {
     if (webContents.isDestroyed() || !dbg.isAttached()) {
@@ -38,13 +44,13 @@ export function createBrowserScreencastDeviceMetrics(
     // Why: Back/Forward and cross-process navigations can drop emulation while
     // the screencast remains attached. Reapply before fallback captures so the
     // page lays out at the client pane size, not the host BrowserView size.
-    await sendDebuggerCommand(dbg, 'Emulation.setDeviceMetricsOverride', {
+    await sendViewportCommand('Emulation.setDeviceMetricsOverride', {
       width: viewportWidth,
       height: viewportHeight,
       deviceScaleFactor,
       mobile: options.mobile === true
     })
-    await sendDebuggerCommand(dbg, 'Emulation.setVisibleSize', {
+    await sendViewportCommand('Emulation.setVisibleSize', {
       width: viewportWidth,
       height: viewportHeight
     }).catch(() => {})
diff --git a/src/main/browser/browser-screencast-lifecycle.test.ts b/src/main/browser/browser-screencast-lifecycle.test.ts
index 251b53fd469..fdf586b0ef8 100644
--- a/src/main/browser/browser-screencast-lifecycle.test.ts
+++ b/src/main/browser/browser-screencast-lifecycle.test.ts
@@ -21,7 +21,7 @@ function createWebContents() {
     attached = false
   })
   debuggerApi.sendCommand = vi.fn(async () => ({}))
-  return { isDestroyed: vi.fn(() => false), debugger: debuggerApi }
+  return { isDestroyed: vi.fn(() => false), isCrashed: vi.fn(() => false), debugger: debuggerApi }
 }
 
 describe('browser screencast lifecycle', () => {
diff --git a/src/main/browser/browser-screencast-snapshot-scaling.test.ts b/src/main/browser/browser-screencast-snapshot-scaling.test.ts
index 4358d618376..1398214f2dc 100644
--- a/src/main/browser/browser-screencast-snapshot-scaling.test.ts
+++ b/src/main/browser/browser-screencast-snapshot-scaling.test.ts
@@ -20,7 +20,12 @@ function createMockWebContents(capturePage: () => Promise<unknown>) {
     attached = false
   })
   dbg.sendCommand = vi.fn(async () => ({}))
-  return { isDestroyed: vi.fn(() => false), debugger: dbg, capturePage: vi.fn(capturePage) }
+  return {
+    isDestroyed: vi.fn(() => false),
+    isCrashed: vi.fn(() => false),
+    debugger: dbg,
+    capturePage: vi.fn(capturePage)
+  }
 }
 
 function createCapturedImage(width: number, height: number) {
diff --git a/src/main/browser/browser-screencast-web-contents-test-double.ts b/src/main/browser/browser-screencast-web-contents-test-double.ts
index 13811850c68..030eec63783 100644
--- a/src/main/browser/browser-screencast-web-contents-test-double.ts
+++ b/src/main/browser/browser-screencast-web-contents-test-double.ts
@@ -10,6 +10,7 @@ export type MockScreencastDebugger = EventEmitter & {
 
 export type MockScreencastWebContents = {
   isDestroyed: ReturnType<typeof vi.fn>
+  isCrashed: ReturnType<typeof vi.fn>
   debugger: MockScreencastDebugger
 }
 
@@ -29,6 +30,7 @@ export function createMockScreencastWebContents(): MockScreencastWebContents {
 
   return {
     isDestroyed: vi.fn(() => false),
+    isCrashed: vi.fn(() => false),
     debugger: dbg
   }
 }
diff --git a/src/main/browser/cdp-debugger-channel.ts b/src/main/browser/cdp-debugger-channel.ts
index f1cddbe20f1..b0c790138e8 100644
--- a/src/main/browser/cdp-debugger-channel.ts
+++ b/src/main/browser/cdp-debugger-channel.ts
@@ -3,6 +3,7 @@ import type { WebContents } from 'electron'
 import { acquireElectronDebugger, type ElectronDebuggerLease } from './electron-debugger-lease'
 import type { CdpClientResponseWriter } from './cdp-client-response-writer'
 import type { CdpSyntheticSessionRegistry } from './cdp-synthetic-session-registry'
+import { sendGuestCdpCommand } from './guest-cdp-command'
 
 /**
  * The IO boundary with webContents.debugger: lease-based attach, event fan-out to
@@ -86,10 +87,9 @@ export class CdpDebuggerChannel {
     params: Record<string, unknown>,
     sessionId?: string
   ): Promise<unknown> {
-    const command = sessionId
-      ? this.webContents.debugger.sendCommand(method, params, sessionId)
-      : this.webContents.debugger.sendCommand(method, params)
-    return Promise.resolve(command)
+    return sessionId
+      ? sendGuestCdpCommand(this.webContents, method, params, sessionId)
+      : sendGuestCdpCommand(this.webContents, method, params)
   }
 
   forwardCommand(
diff --git a/src/main/browser/cdp-debugger-lifecycle.ts b/src/main/browser/cdp-debugger-lifecycle.ts
index 225eb689dba..0880f9926a4 100644
--- a/src/main/browser/cdp-debugger-lifecycle.ts
+++ b/src/main/browser/cdp-debugger-lifecycle.ts
@@ -4,6 +4,7 @@ import type { CdpTabState } from './cdp-auxiliary-commands'
 import type { CdpCommandSender } from './snapshot-engine'
 import type { CdpBridgeState } from './cdp-bridge-state'
 import { createCdpDebuggerMessageListener } from './cdp-debugger-events'
+import { sendGuestCdpCommand } from './guest-cdp-command'
 
 export class CdpDebuggerLifecycle {
   constructor(private readonly bridgeState: CdpBridgeState) {}
@@ -83,7 +84,7 @@ export class CdpDebuggerLifecycle {
 
   makeCdpSender(guest: WebContents, sessionId?: string): CdpCommandSender {
     return (method: string, params?: Record<string, unknown>) => {
-      const command = guest.debugger.sendCommand(method, params, sessionId) as Promise<unknown>
+      const command = sendGuestCdpCommand(guest, method, params, sessionId)
       // Why: Electron's CDP sendCommand can hang on a stale debugger session, so a 10s timeout bounds the RPC.
       let timer: ReturnType<typeof setTimeout>
       return Promise.race([
diff --git a/src/main/browser/cdp-ws-proxy-test-harness.ts b/src/main/browser/cdp-ws-proxy-test-harness.ts
index c66a3cbf6b1..3f5765c18ab 100644
--- a/src/main/browser/cdp-ws-proxy-test-harness.ts
+++ b/src/main/browser/cdp-ws-proxy-test-harness.ts
@@ -25,6 +25,7 @@ export type MockWebContents = {
   webContents: {
     debugger: MockDebugger
     isDestroyed: () => boolean
+    isCrashed: () => boolean
     focus: Mock<() => void>
     printToPDF: Mock<() => Promise<Buffer>>
     reload: Mock<() => void>
@@ -72,6 +73,7 @@ export function createMockWebContents(): MockWebContents {
     webContents: {
       debugger: debuggerObj,
       isDestroyed: () => destroyed,
+      isCrashed: () => false,
       focus: vi.fn(),
       printToPDF: vi.fn(async () => Buffer.from('%PDF-test')),
       reload: vi.fn(),
diff --git a/src/main/browser/guest-cdp-command.test.ts b/src/main/browser/guest-cdp-command.test.ts
new file mode 100644
index 00000000000..3ad71959681
--- /dev/null
+++ b/src/main/browser/guest-cdp-command.test.ts
@@ -0,0 +1,57 @@
+import { describe, expect, it, vi } from 'vitest'
+import { BrowserError } from './browser-error'
+import { sendGuestCdpCommand } from './guest-cdp-command'
+
+function makeGuest(state: { crashed?: boolean; destroyed?: boolean } = {}) {
+  const sendCommand = vi.fn(async () => ({ ok: true }))
+  const guest = {
+    isDestroyed: vi.fn(() => state.destroyed ?? false),
+    isCrashed: vi.fn(() => {
+      if (state.destroyed) {
+        throw new Error('Object has been destroyed')
+      }
+      return state.crashed ?? false
+    }),
+    debugger: { sendCommand }
+  }
+  return { guest, sendCommand }
+}
+
+describe('sendGuestCdpCommand', () => {
+  it.each(['Emulation.setDeviceMetricsOverride', 'Emulation.setVisibleSize'])(
+    'refuses %s while the renderer is gone instead of letting Chromium crash the app',
+    async (method) => {
+      const { guest, sendCommand } = makeGuest({ crashed: true })
+      const sent = sendGuestCdpCommand(guest, method, { width: 375, height: 667 })
+      await expect(sent).rejects.toBeInstanceOf(BrowserError)
+      await expect(sent).rejects.toMatchObject({ code: 'browser_cdp_error' })
+      expect(sendCommand).not.toHaveBeenCalled()
+    }
+  )
+
+  it('refuses a resize on a destroyed guest without asking it whether it crashed', async () => {
+    const { guest, sendCommand } = makeGuest({ destroyed: true })
+    await expect(
+      sendGuestCdpCommand(guest, 'Emulation.setDeviceMetricsOverride', { width: 1, height: 1 })
+    ).rejects.toBeInstanceOf(BrowserError)
+    expect(sendCommand).not.toHaveBeenCalled()
+  })
+
+  it('still sends commands that do not resize the view to a crashed guest', async () => {
+    const { guest, sendCommand } = makeGuest({ crashed: true })
+    await expect(
+      sendGuestCdpCommand(guest, 'Emulation.setUserAgentOverride', { userAgent: 'x' })
+    ).resolves.toEqual({ ok: true })
+    expect(sendCommand).toHaveBeenCalledWith('Emulation.setUserAgentOverride', { userAgent: 'x' })
+  })
+
+  it('sends a resize to a live guest, and passes a session id only when one is given', async () => {
+    const { guest, sendCommand } = makeGuest()
+    await sendGuestCdpCommand(guest, 'Emulation.setVisibleSize', { width: 2, height: 3 })
+    await sendGuestCdpCommand(guest, 'DOM.enable', {}, 'iframe-session')
+    expect(sendCommand.mock.calls).toEqual([
+      ['Emulation.setVisibleSize', { width: 2, height: 3 }],
+      ['DOM.enable', {}, 'iframe-session']
+    ])
+  })
+})
diff --git a/src/main/browser/guest-cdp-command.ts b/src/main/browser/guest-cdp-command.ts
new file mode 100644
index 00000000000..ed7735df2d8
--- /dev/null
+++ b/src/main/browser/guest-cdp-command.ts
@@ -0,0 +1,42 @@
+import type { WebContents } from 'electron'
+import { BrowserError } from './browser-error'
+
+// Why: Chromium resizes the page's view for these without checking the view still exists
+// (WebContentsImpl::SetDeviceEmulationSize). A crashed renderer takes its view with it until the
+// reload builds a new one, so one of these sent in that gap segfaults Orca's main process.
+const VIEW_RESIZING_CDP_METHODS: ReadonlySet<string> = new Set([
+  'Emulation.setDeviceMetricsOverride',
+  'Emulation.setVisibleSize'
+])
+
+type GuestCdpTarget = Pick<WebContents, 'isDestroyed' | 'isCrashed'> & {
+  debugger: Pick<WebContents['debugger'], 'sendCommand'>
+}
+
+/**
+ * The gate for guest CDP commands: every viewport writer and every sender that forwards a caller's
+ * method (agent bridge, CDP proxy) goes through here, so none can hand Chromium a command that
+ * crashes the app while the guest's renderer is dead.
+ */
+export function sendGuestCdpCommand(
+  guest: GuestCdpTarget,
+  method: string,
+  params?: Record<string, unknown>,
+  sessionId?: string
+): Promise<unknown> {
+  // Why same task as the send: isCrashed() flips in the same Chromium task that drops the view,
+  // so checking right before sendCommand leaves no gap for the renderer to die in between.
+  if (VIEW_RESIZING_CDP_METHODS.has(method) && (guest.isDestroyed() || guest.isCrashed())) {
+    return Promise.reject(
+      new BrowserError(
+        'browser_cdp_error',
+        'The page crashed; its viewport can be changed again once it reloads.'
+      )
+    )
+  }
+  return Promise.resolve(
+    sessionId === undefined
+      ? guest.debugger.sendCommand(method, params)
+      : guest.debugger.sendCommand(method, params, sessionId)
+  )
+}