SessionStart hook crashes with AttributeError when payload is None

[ibragh]

The mgrep_watch.py SessionStart hook crashes when read_hook_input() returns None:

hooks/mgrep_watch.py:35:
    payload = read_hook_input()
    cwd = payload.get("cwd")  # AttributeError: 'NoneType' object has no attribute 'get'

read_hook_input() can return None when stdin is empty or contains invalid JSON, but line 35 calls .get() on it without a null check.

This produces a SessionStart:startup hook error on every Claude Code session start.

Suggested fix: Add a guard before accessing payload:

payload = read_hook_input()
if not payload:
    sys.exit(1)
cwd = payload.get("cwd")

[Smilence7]

same