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Extension host terminated unexpectedly
Exact error
Extension host terminated unexpectedly.
What it means
Cursor is built on VS Code; this means the process that runs extensions crashed. Usually one extension is at fault.
Likely causes
- A misbehaving or incompatible extension.
- Running out of memory on very large workspaces.
How to fix it
Run "Developer: Restart Extension Host" from the Command Palette.
Start with extensions disabled to confirm:
cursor --disable-extensionsRe-enable extensions one at a time (or use "Help: Start Extension Bisect") to find the culprit, then update or remove it.
Prevent this next time
- Commit before letting the agent make large changes so you can always roll back.
- Put recurring instructions in project rules instead of repeating them in chat.
FAQ
What does "Extension host terminated unexpectedly" mean?
Cursor is built on VS Code; this means the process that runs extensions crashed. Usually one extension is at fault.
What usually causes it?
A misbehaving or incompatible extension. Running out of memory on very large workspaces.
How do I fix it?
1. Run "Developer: Restart Extension Host" from the Command Palette. 2. Start with extensions disabled to confirm: 3. Re-enable extensions one at a time (or use "Help: Start Extension Bisect") to find the culprit, then update or remove it.
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