[Bug] Run strict mode will cause codex crash

The command:
```
Use InferMatrixCopilot in Strict mode to review https://github.com/vllm-project/vllm-omni/pull/5831
```

<img width="733" height="285" alt="Image" src="https://github.com/user-attachments/assets/ab487c21-35e1-4c72-80e1-439efbee3311" />