claude-code - 💡(How to fix) Fix [Bug] claude --resume crashes with "FKH is not a function" in v2.1.120 [2 comments, 3 participants]

Running claude -r (or claude --resume) crashes immediately with a JavaScript error: Fatal crash with the following error: ERROR FKH is not a function. (In 'FKH(K)', 'FKH' is undefined)

• The error occurs before any user configuration is read, so it is unrelated to local settings

TL;DR

The most likely fix is to add a null-check for the FKH function before calling it to prevent the crash when the feature is disabled.

Guidance

• Verify that the issue is indeed caused by the missing null-check for FKH by checking the XJ7 function return value when the feature is disabled.
• Add a null-check for FKH before calling it, e.g., if (FKH) FKH(K).
• Review the XJ7 function to ensure it returns the expected values for onSessionRestored when the feature is enabled or disabled.
• Consider adding a default value or a fallback for FKH when it is undefined to prevent similar issues in the future.

Example

s8.useEffect(() => {
  if (K && K.length > 0) {
    if (FKH) FKH(K); // add null-check
  }
}, []);

Notes

The provided analysis suggests that the issue is a regression introduced in version 2.1.120, and the workaround is to start a new session manually. The fix should be applied to the claude codebase to prevent the crash when resuming a session.

Recommendation

Apply the workaround by adding a null-check for FKH before calling it, as this is a straightforward fix that can prevent the crash without requiring a full version upgrade.