# Agent input submit button is disabled due to React Error #418 (Web & Desktop) **URL:** \ **Category:** Bug Reports\ **Tags:** chat\ **Created:** [June 27, 2026, 6:26am UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185 "2026-06-27T06:26:59Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Takuma\_Kasuya](https://avatars.discourse-cdn.com/v4/letter/t/65b543/32.png) [@Takuma\_Kasuya](https://forum.cursor.com/u/Takuma_Kasuya)\ **Post date:** [June 27, 2026, 6:26am UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185/1 "2026-06-27T06:26:59Z")
### 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 ---
**Author:** ![Takuma\_Kasuya](https://avatars.discourse-cdn.com/v4/letter/t/65b543/32.png) [@Takuma\_Kasuya](https://forum.cursor.com/u/Takuma_Kasuya)\ **Post date:** [June 27, 2026, 6:28am UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185/4 "2026-06-27T06:28:51Z")
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 ---
**Author:** ![Colin](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/colin/32/90452_2.png) [@Colin](https://forum.cursor.com/u/Colin)\ **Post date:** [June 29, 2026, 1:26pm UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185/6 "2026-06-29T13:26:31Z")
Hey @Takuma_Kasuya! There was a similarish report last week, but I haven’t been able to reproduce. > [@Can’t submit message using mobile](https://forum.cursor.com/t/can-t-submit-message-using-mobile/164067): > > Seems this is a known issue where mobile users cannot send messages in the Cursor web UI. Has anyone found a workaround for this? The send message button is greyed out, seems like it doesn’t see that I have typed a message. Other users reported resizing window (rotating device) or using desktop site but neither seem to work on latest iOS with Brave or Safari The only way I could was to not have a branch selected. > [@Can’t submit message using mobile](https://forum.cursor.com/t/can-t-submit-message-using-mobile/164067/5): > > Hi @catbread! This only happens to me if I don’t have a repository selected. Have you selected a repo/branch? Please share a screenshot if so! Could that be the case here? Could you share a screenshot of what you’re seeing? ---
**Author:** ![catbread](https://avatars.discourse-cdn.com/v4/letter/c/45deac/32.png) [@catbread](https://forum.cursor.com/u/catbread)\ **Post date:** [June 29, 2026, 6:57pm UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185/8 "2026-06-29T18:57:37Z")
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](https://us1.discourse-cdn.com/cursor1/original/3X/4/9/494512f433b6977a3f336c3c468910903c486b6b.png) ---
**Author:** ![catbread](https://avatars.discourse-cdn.com/v4/letter/c/45deac/32.png) [@catbread](https://forum.cursor.com/u/catbread)\ **Post date:** [June 29, 2026, 7:02pm UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185/9 "2026-06-29T19:02:39Z")
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 ---
**Author:** ![system](https://sea3.discourse-cdn.com/cursor1/user_avatar/forum.cursor.com/system/32/99069_2.png) [@system](https://forum.cursor.com/u/system)\ **Post date:** [August 5, 2026, 3:24pm UTC](https://forum.cursor.com/t/agent-input-submit-button-is-disabled-due-to-react-error-418-web-desktop/164185/12 "2026-08-05T15:24:03Z")
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