Hey, thanks for the report. This is a known issue. Plan Mode: the plan update tool requires an exact text match (including spaces/formatting), which often causes updates to fail.
Confirmed case and temporary solutions here:
- Acknowledged bug + workaround: Cursor planning mode crash
While we fix it, try:
- Copy the plan’s markdown into a new agent window and continue from there
- Or save the plan to the working folder
.cursor/plansand edit/recreate the plan from there - If you want to try updates: first ask the agent to “read the current plan” and use the exact text for replacement
Could you please share:
- Screenshots of errors from Help → Toggle Developer Tools → Console at the time of the crash
- Results of running with extensions disabled:
cursor --disable-extensions - Whether it reproduces in a new chat with a fresh plan
Let me know if any of these options help. I’ll attach your case to the investigation.