diff --git a/src/renderer/src/components/browser-pane/host-guest/browser-page-guest-recovery.ts b/src/renderer/src/components/browser-pane/host-guest/browser-page-guest-recovery.ts
index 45f3b354b5..b6e30917d1 100644
--- a/src/renderer/src/components/browser-pane/host-guest/browser-page-guest-recovery.ts
+++ b/src/renderer/src/components/browser-pane/host-guest/browser-page-guest-recovery.ts
@@ -21,6 +21,7 @@ type BrowserPageGuestRecoveryOptions = {
 export type BrowserPageGuestRecovery = {
   confirmRegistration: () => void
   dispose: () => void
+  isDisposed: () => boolean
   finish: () => boolean
   recoverRenderer: () => void
   retryRecovery: () => void
@@ -263,6 +264,7 @@ export function createBrowserPageGuestRecovery(
       clearValidationRetry()
       clearValidationTimeout()
     },
+    isDisposed: () => disposed,
     finish,
     recoverRenderer,
     retryRecovery: () => {
diff --git a/src/renderer/src/components/browser-pane/host-guest/browser-page-webview-guest-session.ts b/src/renderer/src/components/browser-pane/host-guest/browser-page-webview-guest-session.ts
index 4623b817b2..dd5e243ba2 100644
--- a/src/renderer/src/components/browser-pane/host-guest/browser-page-webview-guest-session.ts
+++ b/src/renderer/src/components/browser-pane/host-guest/browser-page-webview-guest-session.ts
@@ -15,7 +15,11 @@ import {
   type BrowserPageGuestRecovery
 } from './browser-page-guest-recovery'
 import { browserPageZoomLevelToPercent, setBrowserPageZoomLevel } from './browser-page-zoom'
-import { registeredWebContentsIds, replacePersistentWebview } from './webview-registry'
+import {
+  registeredWebContentsIds,
+  replacePersistentWebview,
+  webviewRegistry
+} from './webview-registry'
 import { browserPageExists } from '../describe-page/browser-page-load-error'
 import type {
   BrowserPageRecoveryNavigationValidation,
@@ -80,11 +84,21 @@ export function createBrowserPageWebviewGuestSession({
     webContentsId: number
     promise: Promise<boolean | null>
   } | null = null
-  const registerGuest = (): Promise<boolean | null> => {
-    let webContentsId: number
+  const readWebContentsId = (): number | null => {
     try {
-      webContentsId = webview.getWebContentsId()
+      return webview.getWebContentsId()
     } catch {
+      return null
+    }
+  }
+  const ownsGuest = (webContentsId: number | null): boolean =>
+    webContentsId !== null &&
+    !guestRecovery.isDisposed() &&
+    webviewRef.current === webview &&
+    webviewRegistry.get(browserTabId) === webview &&
+    readWebContentsId() === webContentsId
+  const registerGuest = (webContentsId: number | null): Promise<boolean | null> => {
+    if (webContentsId === null || !ownsGuest(webContentsId)) {
       return Promise.resolve(null)
     }
     if (registrationInFlight?.webContentsId === webContentsId) {
@@ -99,6 +113,9 @@ export function createBrowserPageWebviewGuestSession({
         webContentsId
       })
       .then((registered) => {
+        if (!ownsGuest(webContentsId)) {
+          return null
+        }
         if (registered) {
           registeredWebContentsIds.set(browserTabId, webContentsId)
           return true
@@ -146,22 +163,26 @@ export function createBrowserPageWebviewGuestSession({
         return null
       }
       if (registeredWebContentsIds.get(browserTabId) !== webContentsId) {
-        return registerGuest()
+        return registerGuest(webContentsId)
       }
       const registered = await window.api.browser.isGuestRegistered({
         browserPageId: browserTabId,
         webContentsId
       })
+      if (!ownsGuest(webContentsId)) {
+        return null
+      }
       if (registered) {
         return true
       }
-      return window.api.browser.repairGuestRegistration({
+      const repaired = await window.api.browser.repairGuestRegistration({
         browserPageId: browserTabId,
         workspaceId,
         worktreeId,
         sessionProfileId,
         webContentsId
       })
+      return ownsGuest(webContentsId) ? repaired : null
     },
     replaceGuest: () => replacePersistentWebview(browserTabId),
     onReplacementReady: () => setGuestRecoveryGeneration((generation) => generation + 1),
@@ -184,7 +205,11 @@ export function createBrowserPageWebviewGuestSession({
 
   const handleDidAttach = (): void => {
     // Why: register at attach since cert failures can precede dom-ready; the dom-ready path stays an idempotent fallback.
-    void registerGuest().then((registered) => {
+    const webContentsId = readWebContentsId()
+    void registerGuest(webContentsId).then((registered) => {
+      if (!ownsGuest(webContentsId)) {
+        return
+      }
       if (registered === true) {
         guestRecovery.confirmRegistration()
       }
@@ -207,7 +232,10 @@ export function createBrowserPageWebviewGuestSession({
     const queuedAnnotationViewportBridgeSync =
       liveWebContentsId === null || registeredWebContentsIds.get(browserTabId) !== liveWebContentsId
     if (queuedAnnotationViewportBridgeSync) {
-      void registerGuest().then((registered) => {
+      void registerGuest(liveWebContentsId).then((registered) => {
+        if (!ownsGuest(liveWebContentsId)) {
+          return
+        }
         const completedRecovery = guestRecovery.finish()
         if (registered === true) {
           guestRecovery.confirmRegistration()