Using option + backspace crashes the app
Resolved 💬 3 comments Opened Sep 20, 2025 by piotrsynowiec Closed Nov 11, 2025
💡 Likely answer: A maintainer (etraut-openai, contributor)
responded on this thread — see the highlighted reply below.
What version of Codex is running?
0.39
Which model were you using?
gpt-5-codex
What platform is your computer?
Darwin 24.6.0 arm64 arm
What steps can reproduce the bug?
I use iTerm for codex. Today I was able to crash the app, while trying to delete the message that I wrote.
I did that by using option + backspace to delete the message as fast as possible. The result was:
The application panicked (crashed).
Message: assertion failed: self.is_char_boundary(n)
Location: tui/src/bottom_pane/textarea.rs:97
Backtrace omitted. Run with RUST_BACKTRACE=1 environment variable to display it.
Run with RUST_BACKTRACE=full to include source snippets.
What is the expected behavior?
I should be able to delete what I wrote
What do you see instead?
_No response_
Additional information
_No response_
3 Comments
Same problem here! MacOs latest build but I was using Command + W to backspace and it crashed with Message: assertion failed: self.is_char_boundary(n)
I have the same issue, with identical error message, started happening only when I switched to iTerm2
I think this has been addressed in more recent versions. If you see this problem in the latest versions of codex, please open a new issue with details.