The window terminated unexpectedly (reason: ‘crashed’, code: ‘5’) - 100% reproducible with Atlassian MCP

Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

The window terminated unexpectedly (reason: ‘crashed’, code: ‘5’)
I use Atlassian MCP. and it started to crash with this prompt: “Let’s collect Jira Custom Required Fields per ticket type.”
Actually, it crashes for any other prompt related to Atlassian MCP, but in 5% it could work.
I noticed that it always crashed when I see “chat summarization” message.
Issue appeared October 6 2025, few days before it was working fine

Steps to Reproduce

  1. Install Atlassian MCP and login
  2. Type in chat “Let’s collect Jira Custom Required Fields per ticket type.”

Expected Behavior

application does not crash

Screenshots / Screen Recordings

cursor-crashed.png
cursor-crashed.png526×407 39.4 KB

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.7.38
VSCode Version: 1.99.3
Commit: fe5d1728063e86edeeda5bebd2c8e14bf4d0f960
Date: 2025-10-06T18:18:58.523Z (19 hrs ago)
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.6.0

For AI issues: which model did you use?

Auto

For AI issues: add Request ID with privacy disabled

236d9714-2b08-4999-9fdd-179fa6df240a

Does this stop you from using Cursor

Sometimes - I can sometimes use Cursor

2 Likes
2

Hey, thanks for the report. Let me know if this happens in your other projects as well. I don’t think it’s related to the mentioned MCP server, but we’ll check.

3

Yes, I’ve tried:

  1. different project
  2. copy current project to different directory
  3. running with disabling extensions flag
  4. clearing cache, npx cache
1 Like
4

Atlassian’s MCP endpoint started returning 404 Missing sessionId responses.

It looks like Cursor’s renderer or MCP handler doesn’t handle the missing sessionId gracefully and throws a TypeError during normalizePath, which tears down the renderer.

6

Reinstalling Cursor IDE from scratch doesn’t help as well. I’m just curious if somebody else has this issue. If I should continue research if something wrong with my environment or it’s just a bug.

7

I am having the exact same issue during summarization while i work with the supabase MCP. I also tried downgrading, changing models, clearing cache and even different laptops Mac M1 and M3. still same issue. its’s been 3 days now and I was hoping it was just not me..

8

I’m seeing the same behaviour with an MCP server I’m writing. As soon as “summarizing chat” appears, cursor crashes.

With a prompt that doesn’t require summarization, it works fine.

1 Like
9

Thanks for the info, we’re looking into it.

1 Like
10

experiencing the same issue with Atlassian MCP - crashes cursor at the end of the summarizing chat context (was the last thing I saw before the crash)

11

Running into the same thing on Mac.

1 Like
12

Looks like this issue was reported at 1.7.38. Just checking in to say it’s still an issue at 1.7.52.

Version: 1.7.52 (Universal)
VSCode Version: 1.99.3
Commit: 9675251a06b1314d50ff34b0cbe5109b78f848c0
Date: 2025-10-17T01:41:03.967Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Darwin arm64 24.5.0

13

Are there any logs one should provide to speed up the correction of this bug? Where does one find them?

14

getting this error every time now, after updating to 2.0.64 version, I believe before it was ~1.9 (before 2.0 at all).
I am working with devcontainers and I do have Jira MCP. Turning off of Jira MCP doesn’t help. All projects are old. Mac OS, M1

15

here what I see in dev tools and process explorer. Nothing suspicious in PE

image
image1920×1362 434 KB