Stuck on "Loading chat" when opening old project

[keving (Kevin)]

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

The chat does not load at all and displays two errors.

One is: [composer] No composer data handle found [updateComposerDataSetStore] when I open the AI panel to chat.

The other is: [composer] No composer data handle found when I attempt to load the history by clicking on the history button.

Steps to Reproduce

I had an old project which I last opened around December 2024, today when I loaded/went back into it now in August 2025, it failed.

Expected Behavior

I expected the chat window to open and load correctly regardless of the version I last opened the project/chat with.

Screenshots / Screen Recordings

Operating System

Windows 10/11

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.5.7 (user setup)
VSCode Version: 1.99.3
Commit: 6aa7b3af0d578b9a3aa3ab443571e1a51ebb4e80
Date: 2025-08-27T22:43:32.248Z
Electron: 34.5.8
Chromium: 132.0.6834.210
Node.js: 20.19.1
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100

Additional Information

The last time I opened this project was December 2024. My cursor is installed on Windows, but the project that’s failing is opened through remote ssh.

I opened the developer panel and got the following info:

workbench.desktop.main.js:6946 Error: [composer] No composer data handle found [updateComposerDataSetStore]
    at Sp.updateComposerDataSetStore (workbench.desktop.main.js:579:265157)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at Otn.setComposerUnifiedMode (workbench.desktop.main.js:605:7577)
    at Otn.getComposerUnifiedMode (workbench.desktop.main.js:605:7407)
    at h1.createComposerImpl (workbench.desktop.main.js:5478:8814)
    at h1.createComposer (workbench.desktop.main.js:5478:6730)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at pll.run (workbench.desktop.main.js:4869:4673)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at handler (workbench.desktop.main.js:54:18351)
    at $fr.invokeFunction (workbench.desktop.main.js:5611:960)
    at workbench.desktop.main.js:5423:2214
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at hVs._tryExecuteCommand (workbench.desktop.main.js:5423:2067)
    at hVs.executeCommand (workbench.desktop.main.js:5423:1617)
    at c$i.run (workbench.desktop.main.js:54:34949)
    at G0.runAction (workbench.desktop.main.js:52:52614)
    at G0.run (workbench.desktop.main.js:52:52517)
    at VI.onClick (workbench.desktop.main.js:436:82923)
    at HTMLLIElement.<anonymous> (workbench.desktop.main.js:420:17694)

Error: [composer] No composer data handle found
    at Sp.updateComposerData (workbench.desktop.main.js:579:265408)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at h1.updateComposer (workbench.desktop.main.js:5473:13691)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at h1.showComposerHistory (workbench.desktop.main.js:5480:969)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at bll.run (workbench.desktop.main.js:4869:6995)
    at workbench.desktop.main.js:52:44659
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at n.value (workbench.desktop.main.js:52:44648)
    at handler (workbench.desktop.main.js:54:18351)
    at $fr.invokeFunction (workbench.desktop.main.js:5611:960)
    at workbench.desktop.main.js:5423:2214
    at Kts (workbench.desktop.main.js:52:44345)
    at i4 (workbench.desktop.main.js:52:44306)
    at hVs._tryExecuteCommand (workbench.desktop.main.js:5423:2067)
    at hVs.executeCommand (workbench.desktop.main.js:5423:1617)
    at c$i.run (workbench.desktop.main.js:54:34949)
    at G0.runAction (workbench.desktop.main.js:52:52614)
    at G0.run (workbench.desktop.main.js:52:52517)
    at VI.onClick (workbench.desktop.main.js:436:82923)
    at HTMLLIElement.<anonymous> (workbench.desktop.main.js:420:17694)

[composer] No composer found for ID: 58292f57-ae26-4cc7-826b-efc2c5490d72

Does this stop you from using Cursor

Yes - Cursor is unusable

[condor (Condor (Tee))]

hi @keving could you update Cursor to the latest version and let me know if you still have the same issue opening that project?

One temporary solution would be to open a new chat, then close Cursor and reopen it.

[keving (Kevin)]

The issue continues to occur and I am on the latest version

[condor (Condor (Tee))]

Thank you @keving for trying that in the latest version. I have forwarded the additional info to the team.

[deanrie]

Hey, I noticed that the chat takes a long time to load if you have the full display mode on. If that’s your case, try switching to compact, it should help.