Agent input submit button is disabled due to React Error #418 (Web & Desktop)

Support Bug Reports
1

Where does the bug appear (feature/product)?

Cursor IDE

Describe the Bug

The Agent input box allows text entry, but the submit/send button remains disabled and unclickable. This issue occurs on both the Web version and the Desktop app.

Looking at the developer console, I see the following error:
Uncaught Error: Minified React error #418

It seems like a server-side vs client-side state/hydration mismatch tied to my specific account, as it persists across different environments.

Steps to Reproduce

  1. Open Cursor (either Desktop App or Web version).
  2. Go to the Agent chat interface.
  3. Type text into the input field.
  4. The submit/send button remains grayed out / disabled.

Expected Behavior

The submit button should become active/enabled once text is typed into the input field so that the message can be sent.

Operating System

Windows 10/11

Version Information

Cursor Version: 3.8.24

Additional Information

Describe the Bug

The Agent input box allows text entry, but the submit/send button remains disabled and unclickable. This issue occurs on both the Web version and the Desktop app.

Looking at the developer console, I see the following error:
Uncaught Error: Minified React error #418

It seems like a server-side vs client-side state/hydration mismatch tied to my specific account, as it persists across different environments.

Steps to Reproduce

  1. Open Cursor (either Desktop App or Web version).
  2. Go to the Agent chat interface.
  3. Type text into the input field.
  4. The submit/send button remains grayed out / disabled.

What I Have Already Tried (Isolated the issue):

To rule out local environment issues, I have already performed the following troubleshooting steps, but none resolved the problem:

  • Unlinked Slack integration.
  • Backed up and cleared MCP settings (moved out of the directory).
  • Cleared all local cache and app data.
  • Reinstalled the latest version (v3.8.24).
  • Reproduced in Web version Incognito Mode (with all browser extensions and auto-translation disabled).

Since this occurs on both Web and Desktop even after a clean install and cache clear, I suspect there is a corrupted state or hydration issue tied to my account data on the server side.

Requested Action

Could the support team or developers please check my account state, reset the agent-related cloud data, or apply a patch?

  • OS: [ Windows 11]
  • Cursor Version: 3.8.24

Does this stop you from using Cursor

Yes - Cursor is unusable

4

Additional troubleshooting already performed:

  • Logged out and back in
  • Unlinked Slack integration
  • Removed MCP configuration
  • Cleared workspaceStorage and globalStorage
  • Reinstalled Cursor (v3.8.24)
  • Reproduced on both Web and Desktop
  • Send button remains disabled after text input
  • Enter/Ctrl+Enter also do not submit
6

Hey @Takuma_Kasuya!

There was a similarish report last week, but I haven’t been able to reproduce.

The only way I could was to not have a branch selected.

Could that be the case here? Could you share a screenshot of what you’re seeing?

8

I actually don’t have any repos selected— or any integrations enabled for it to find repos. That’s unfortunate since I just wanted to use cursor on mobile occasionally for general purpose questions.

Here’s the screenshot anyway. Maybe if I point it to an empty repo it will fix itself

IMG_0045
IMG_00451320×2868 130 KB

9

Yep, connecting to a repo actually enables the button. I would suggest perhaps some indicator that the text box is disabled until a repo is selected, otherwise you’ll get posts like this