claude-code - 💡(How to fix) Fix [BUG] claude -c crashes with FKH is not a function when resuming a session with prior messages [2 comments, 3 participants]

Preflight Checklist

• I have searched existing issues and this hasn't been reported yet
• This is a single bug report (please file separate reports for different bugs)
• I am using the latest version of Claude Code

What's Wrong?

Running claude -c (continue) on any project that has an existing session with non-empty message history immediately crashes with:

ERROR FKH is not a function. (In 'FKH(K)', 'FKH' is undefined) B:/~BUN/root/src/entrypoints/cli.js:9273:5663

The error fires before the UI renders, so the session is unusable. claude (fresh session, no -c) works fine.

Environment

• OS: Windows 11 Home (10.0.26200)
• Shell: PowerShell
• Claude Code: <please fill in claude --version output>
• Working directory: a project with existing .jsonl session files under %USERPROFILE%.claude\projects<project>\

Reproduction

1. In any project that already has at least one session with messages, run claude -c
2. Observe the crash above; the session id printed in the "Resume this session with: claude --resume " hint is the session being loaded
3. Reproduces 100% on that project; running plain claude (new session) succeeds

Root Cause Analysis (from the bundled cli.js)

The crash is in the REPL component (function hCq) and stems from a destructuring mismatch, not from corrupt session data.

1. S is hard-coded to false:

S = s8.useMemo(() => !1, []) 2. XJ7({ enabled: S, ... }) is called with enabled: false, which causes the early-return / no-op branch and does not return onSessionRestored:

let { onBeforeQuery: UKH, onTurnComplete: LVH, onSessionRestored: FKH, render: iW8, ownsInput: ZVH } = XJ7({ enabled: S, ... })

1. So FKH === undefined.
2. The mount effect calls FKH(K) unconditionally whenever the initial messages array K is non-empty:

s8.useEffect(() => { if (K && K.length > 0) sW8(K, Kq()), GMq(...), BIq(K), pc(K), oMH.current.current = I38(K, Fq), FKH(K) // ← crashes here when enabled:false }, [])

So any claude -c (or --resume) into a session that has prior messages triggers the crash, because FKH is only defined when XJ7 is enabled, but the effect that calls it doesn't gate on enabled.

Suggested Fix

Either:

• Make the XJ7({ enabled: false }) branch return a no-op onSessionRestored, or
• Guard the call site: FKH?.(K) / if (FKH) FKH(K).

Workaround

Start a fresh session with plain claude (no -c / --resume) — works because the K.length > 0 branch isn't taken.

Stack Trace

• <anonymous> (B:/~BUN/root/src/entrypoints/cli.js:9273:5663)
• PI (B:/~BUN/root/src/entrypoints/cli.js:512:63749)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76948)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:77745)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:76926)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
• Fw (B:/~BUN/root/src/entrypoints/cli.js:512:77745)
• P5 (B:/~BUN/root/src/entrypoints/cli.js:512:76827)
• async <anonymous> (B:/~BUN/root/src/entrypoints/cli.js:19019:11089)

What Should Happen?

claude -c (and claude --resume <id>) should successfully restore the previous session and render the REPL, regardless of whether the session has prior messages. Specifically:

• The mount effect that runs when initial messages K are present must not throw — onSessionRestored (FKH in the bundle) should always be safely callable.
• When XJ7 is invoked with enabled: false, it should still return a no-op onSessionRestored (matching the shape it returns when enabled), or the call site should guard with FKH?.(K).
• End-user impact: continuing a previous session should drop me into the loaded conversation history with no error overlay, exactly as claude (new session) does today.

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce

1. Open a terminal (PowerShell on Windows 11 in my case) and cd into any project directory that already has at least one Claude Code session with prior messages — i.e. a non-empty *.jsonl under %USERPROFILE%.claude\projects<project-slug>. - In my case: cd D:\parker\etton-erp (slug D--parker-etton-erp, contains a 1.4 MB session jsonl with substantial history).
2. Run: claude -c
3. (equivalent: claude --resume <session-id> against the same session.)
4. Observe the immediate crash before the REPL renders: ERROR FKH is not a function. (In 'FKH(K)', 'FKH' is undefined) B:/~BUN/root/src/entrypoints/cli.js:9273:5663
5. The CLI prints a "Resume this session with: claude --resume " hint and exits.
6. Confirm it is not data corruption: run plain claude (no -c) in the same directory — a fresh session starts cleanly with no error.
7. Confirm it is reproducible on the same session: re-run claude -c or claude --resume <id> against that session — crashes 100% of the time.

Expected: step 3 loads the prior conversation and shows the REPL. Actual: step 3 throws FKH is not a function and never renders.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.120 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

No response