diff --git a/src/main/claude/claude-structured-prompt-ownership.ts b/src/main/claude/claude-structured-prompt-ownership.ts
index 7694fe3d8eb..569a519c69b 100644
--- a/src/main/claude/claude-structured-prompt-ownership.ts
+++ b/src/main/claude/claude-structured-prompt-ownership.ts
@@ -77,8 +77,14 @@ export async function cancelClaudeStructuredTurn(input: {
   // The translator owns turn identity. A session with no journal has published no
   // turn row for a client to name, so it holds no identity this request can contradict.
   const ownsRequestedTurn = (): boolean => {
-    const currentTurnId = session.translator?.currentTurnId ?? null
-    return currentTurnId === null || currentTurnId === request.turnId
+    const translator = session.translator
+    if (!translator) {
+      return session.dispatchSequence === 0
+    }
+    const currentTurnId = translator.currentTurnId
+    return currentTurnId === null
+      ? session.dispatchSequence === 0
+      : currentTurnId === request.turnId
   }
   const isCurrent = (): boolean =>
     sessions.get(request.sessionId) === session &&
diff --git a/src/main/claude/claude-turn-ownership.test.ts b/src/main/claude/claude-turn-ownership.test.ts
index 05bd15bc630..7616e011989 100644
--- a/src/main/claude/claude-turn-ownership.test.ts
+++ b/src/main/claude/claude-turn-ownership.test.ts
@@ -109,6 +109,26 @@ describe('Claude turn ownership', () => {
     expect(connection.calls.some((call) => call.subtype === 'interrupt')).toBe(true)
   })
 
+  it('refuses a stale id after the owned turn settles', async () => {
+    const claude = fakeClaude({ replayUuid: 'echo-turn' })
+    const { adapter, bodies, connection } = await acquiredWithJournal(claude)
+
+    await adapter.dispatch({
+      sessionId: 'session-1',
+      clientMessageId: 'client-1',
+      body: USER_MESSAGE,
+      fence: 7
+    })
+    expect(runningTurnId(bodies)).toBe('echo-turn')
+    completeTurn(connection, 'result-1')
+    expect(runningTurnId(bodies)).toBeNull()
+
+    await expect(
+      adapter.cancelTurn({ sessionId: 'session-1', turnId: 'echo-turn', fence: 7 })
+    ).resolves.toEqual({ cancelled: false })
+    expect(connection.calls.some((call) => call.subtype === 'interrupt')).toBe(false)
+  })
+
   it('still stops an echo-opened turn', async () => {
     const claude = fakeClaude({ replayUuid: 'echo-turn' })
     const { adapter, bodies, connection } = await acquiredWithJournal(claude)