claude-code - 💡(How to fix) Fix Crash on --resume/--continue after branching session history (Esc Esc): g9H is not a function [2 comments, 3 participants]

Bug Description

When resuming a session that has been branched multiple times by going back in time (using Esc Esc to rewind), both --resume and --continue crash with an undefined function error.

Steps to Reproduce

1. Start a Claude Code session
2. Branch the conversation multiple times by pressing Esc Esc to go back in history
3. Exit the session
4. Attempt to resume with claude --dangerously-skip-permissions --resume or claude --dangerously-skip-permissions --continue

Error Output

ERROR  g9H is not a function. (In 'g9H(K)', 'g9H' is undefined)

 /$bunfs/root/src/entrypoints/cli.js:9251:5663

Stack Trace

 - <anonymous> (/$bunfs/root/src/entrypoints/cli.js:9251:5663)
 - WC (/$bunfs/root/src/entrypoints/cli.js:492:63749)
 - pj (/$bunfs/root/src/entrypoints/cli.js:492:76948)
 - fT (/$bunfs/root/src/entrypoints/cli.js:492:76827)
 - pj (/$bunfs/root/src/entrypoints/cli.js:492:76926)
 - fT (/$bunfs/root/src/entrypoints/cli.js:492:76827)
 - pj (/$bunfs/root/src/entrypoints/cli.js:492:77745)
 - fT (/$bunfs/root/src/entrypoints/cli.js:492:76827)
 - pj (/$bunfs/root/src/entrypoints/cli.js:492:76926)
 - fT (/$bunfs/root/src/entrypoints/cli.js:492:76827)

Analysis

From the minified source, g9H maps to onSessionRestored — a callback destructured from FXK() (appears to be a plugin/extension hook system). The crash occurs during REPL initialization when the session restore path calls g9H(K) (i.e., onSessionRestored(initialMessages)), but the function is undefined.

The relevant destructuring at the call site:

let {onBeforeQuery: F9H, onTurnComplete: ZLH, onSessionRestored: g9H, render: aM_, ownsInput: LLH} = FXK({enabled: S, ...})

The function is called during the initial useEffect:

s_.useEffect(() => {
    if (K && K.length > 0)
        HP_(K, K8()), ..., g9H(K)  // crashes here
}, []);

It seems like the FXK hook returns undefined for onSessionRestored when the session has a forked/branched history, possibly because the enabled flag (S) evaluates to false for branched sessions and the hook doesn't return a no-op fallback.

Environment

• OS: macOS (Darwin 24.6.0)
• Shell: zsh
• Claude Code version: Latest as of 2026-04-25
• Model: claude-opus-4-6 (1M context)