Zed crashes when inserting # on first line in yaml

[mmhartmann]

Summary

Zed crashes when inserting # on the first non empty line in a non empty yaml file.

Description

Steps to trigger the problem:

1. Create a yaml file or an empty file with yaml selected as a language
2. Type something
3. Create an empty line above your text
4. Insert #

Actual Behavior: Editor crashes Expected Behavior: No crash

Zed Version and System Specs

Zed: v0.187.8 (Zed) OS: macOS 15.4.1 Memory: 16 GiB Architecture: aarch64

If applicable, attach your ~/Library/Logs/Zed/Zed.log file to this issue.

Zed.log

2025-05-25T15:00:19+02:00 INFO  [zed] ========== starting zed ==========
2025-05-25T15:00:19+02:00 INFO  [db] Opening main db
2025-05-25T15:00:19+02:00 INFO  [db] Opening main db
2025-05-25T15:00:19+02:00 INFO  [zed] Using git binary path: Some("/Applications/Zed.app/Contents/MacOS/git")
2025-05-25T15:00:19+02:00 INFO  [prompt_store::prompts] No prompt template overrides directory found at /Users/ukf/.config/zed/prompt_overrides. Using built-in prompts.
2025-05-25T15:00:19+02:00 INFO  [assistant_tools::terminal_tool] agent selected bash for terminal tool
2025-05-25T15:00:19+02:00 INFO  [extension_host] extensions updated. loading 9, reloading 0, unloading 0
2025-05-25T15:00:19+02:00 INFO  [util] set environment variables from shell:/bin/zsh, path:/Users/ukf/.sdkman/candidates/java/current/bin:/opt/homebrew/opt/openjdk/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/TeX/texbin:/Users/ukf/Library/Application Support/JetBrains/Toolbox/scripts
2025-05-25T15:00:19+02:00 INFO  [db] Opening main db
2025-05-25T15:00:19+02:00 INFO  [db] Opening main db
2025-05-25T15:00:19+02:00 INFO  [db] Opening main db
2025-05-25T15:00:19+02:00 INFO  [client] set status on client 0: Authenticating
2025-05-25T15:00:19+02:00 INFO  [db] Opening main db
2025-05-25T15:00:19+02:00 INFO  [client] set status on client 337435: Connecting
2025-05-25T15:00:19+02:00 INFO  [client] connected to rpc endpoint https://collab.zed.dev/rpc
2025-05-25T15:00:20+02:00 INFO  [rpc::peer] add_connection;
2025-05-25T15:00:20+02:00 INFO  [client] set status on client 337435: Connected { peer_id: PeerId { owner_id: 815, id: 1779944 }, connection_id: ConnectionId { owner_id: 0, id: 0 } }
2025-05-25T15:00:29+02:00 INFO  [project::prettier_store] Initializing default prettier with plugins {}