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openclaw - 💡(How to fix) Fix EmbeddedAttemptSessionTakeoverError: isolated cron sessions collide with active main session

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Isolated cron sessions (sessionTarget: "isolated") intermittently fail with EmbeddedAttemptSessionTakeoverError when the main agent session is concurrently active (e.g., user is chatting via Telegram).

Error Message

EmbeddedAttemptSessionTakeoverError: session file changed while embedded prompt lock was released: /Users/.../.openclaw/agents/main/sessions/<uuid>.jsonl

Root Cause

Isolated cron sessions (sessionTarget: "isolated") intermittently fail with EmbeddedAttemptSessionTakeoverError when the main agent session is concurrently active (e.g., user is chatting via Telegram).

Fix Action

Workaround

Shifted the cron schedule to a time when the main session is unlikely to be active.

Code Example

EmbeddedAttemptSessionTakeoverError: session file changed while embedded prompt lock was released: /Users/.../.openclaw/agents/main/sessions/<uuid>.jsonl
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Summary

Isolated cron sessions (sessionTarget: "isolated") intermittently fail with EmbeddedAttemptSessionTakeoverError when the main agent session is concurrently active (e.g., user is chatting via Telegram).

Error

EmbeddedAttemptSessionTakeoverError: session file changed while embedded prompt lock was released: /Users/.../.openclaw/agents/main/sessions/<uuid>.jsonl

Reproduction

  • An isolated cron job fires while the main agent session is handling an inbound message
  • The isolated session creates its own session file under agents/main/sessions/
  • Both sessions write to the journal concurrently
  • The embedded runner detects the file change and aborts

Frequency

Happens reliably when cron fires during active chat. Recent examples:

  • 2026-05-29 10:30 — exercise nudge failed (main session active)
  • 2026-05-27 10:30 — same job, same error

Jobs that fire at low-traffic times (e.g., 06:00, 02:00) never hit this.

Expected behavior

Isolated cron sessions should not share or conflict with the main agent session's journal. They should be fully independent.

Workaround

Shifted the cron schedule to a time when the main session is unlikely to be active.

Environment

  • OpenClaw 2026.5.27 (27ae826)
  • macOS (arm64), Node v24.13.0

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FAQ

Expected behavior

Isolated cron sessions should not share or conflict with the main agent session's journal. They should be fully independent.

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openclaw - 💡(How to fix) Fix EmbeddedAttemptSessionTakeoverError: isolated cron sessions collide with active main session