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reproduce method: application error: a client-side exception has occurred (see the browser console for more information). #12833

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opened 2026-02-21 19:09:17 -05:00 by yindo · 3 comments
yindo commented 2026-02-21 19:09:17 -05:00
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Originally created by @mrhan1993 on GitHub (Apr 12, 2025).

Self Checks

  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
  • [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:)
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.2.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

Reproducible.

  1. Create a new CHATFLOW.
  2. Create a Session variable.
  3. Add a variable assignment node.
  4. Select a variable.
  5. Click the x button after the variable.
Image

Image

✔️ Expected Behavior

Clear variable selection. The variable option box is empty.

❌ Actual Behavior

application error: a client-side exception has occurred (see the browser console for more information).

Originally created by @mrhan1993 on GitHub (Apr 12, 2025). ### Self Checks - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report (我已阅读并同意 [Language Policy](https://github.com/langgenius/dify/issues/1542)). - [x] [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:) - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.2.0 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce Reproducible. 1. Create a new CHATFLOW. 2. Create a Session variable. 3. Add a variable assignment node. 4. Select a variable. 5. Click the x button after the variable. <img width="645" alt="Image" src="https://github.com/user-attachments/assets/a4722897-1c9c-4153-9dd0-f30324a3aea3" /> ![Image](https://github.com/user-attachments/assets/62491d0f-72b7-4418-a483-e98653716886) ### ✔️ Expected Behavior Clear variable selection. The variable option box is empty. ### ❌ Actual Behavior application error: a client-side exception has occurred (see the browser console for more information).
yindo added the 🐞 buggood first issue labels 2026-02-21 19:09:17 -05:00
yindo closed this issue 2026-02-21 19:09:17 -05:00
yindo commented 2026-02-21 19:09:17 -05:00
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@dosubot[bot] commented on GitHub (Apr 12, 2025):

Hello @mrhan1993! I'm Dosu, a bot here to assist you with bug fixes, answer your questions, and help you on your journey to becoming a contributor. I'm ready to help while we wait for a human maintainer to join the conversation!

I found some similar discussions regarding client-side exceptions in Dify:

  1. Application error: a client-side exception has occurred (see the browser console for more information) - This discussion is still open and might provide insights into similar issues [1].

  2. Application error: a client-side exception has occurred (see the browser console for more information) - This is another open discussion that might be relevant [2].

  3. When entering the editing agent or app page, an error occurs: "Application error: a client-side exception has occurred (see the browser console for more information)" - This discussion is also open and could be related to your issue [3].

For your specific issue, it seems related to the 'x button' functionality in the workflow editor. Unfortunately, I couldn't find specific documentation on known issues related to the 'x button' functionality. However, common causes of client-side exceptions in Dify's workflow editor include issues like code node errors, sandbox network issues, and output validation errors, among others [4].

You might want to check the browser console for more detailed error messages, which could help in diagnosing the problem further.

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other

@dosubot[bot] commented on GitHub (Apr 12, 2025): <!-- Greeting --> Hello @mrhan1993! I'm [Dosu](https://dosu.dev), a bot here to assist you with bug fixes, answer your questions, and help you on your journey to becoming a contributor. I'm ready to help while we wait for a human maintainer to join the conversation! <!-- Answer --> I found some similar discussions regarding client-side exceptions in Dify: 1. [Application error: a client-side exception has occurred (see the browser console for more information)](https://github.com/langgenius/dify/discussions/15438) - This discussion is still open and might provide insights into similar issues <sup>[[1]](https://github.com/langgenius/dify/discussions/15438)</sup>. 2. [Application error: a client-side exception has occurred (see the browser console for more information)](https://github.com/langgenius/dify/discussions/14294) - This is another open discussion that might be relevant <sup>[[2]](https://github.com/langgenius/dify/discussions/14294)</sup>. 3. [When entering the editing agent or app page, an error occurs: "Application error: a client-side exception has occurred (see the browser console for more information)"](https://github.com/langgenius/dify/discussions/14076) - This discussion is also open and could be related to your issue <sup>[[3]](https://github.com/langgenius/dify/discussions/14076)</sup>. For your specific issue, it seems related to the 'x button' functionality in the workflow editor. Unfortunately, I couldn't find specific documentation on known issues related to the 'x button' functionality. However, common causes of client-side exceptions in Dify's workflow editor include issues like code node errors, sandbox network issues, and output validation errors, among others <sup>[[4]](https://github.com/langgenius/dify-docs/blob/main/en/guides/workflow/error-handling/error-type.md)</sup>. You might want to check the browser console for more detailed error messages, which could help in diagnosing the problem further. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* --- <sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/775a57cd-523e-4e17-b3c8-31d8073f34d3?feedback_type=other)</sup>
yindo commented 2026-02-21 19:09:17 -05:00
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@mrhan1993 commented on GitHub (Apr 12, 2025):

@dosu It is indeed the same problem. What I mainly provide is a reproduction method. In addition, although the error message indicates that it comes from the browser. But in fact, it has nothing to do with the browser. The problem comes from the variable assignment node.

@mrhan1993 commented on GitHub (Apr 12, 2025): @dosu It is indeed the same problem. What I mainly provide is a reproduction method. In addition, although the error message indicates that it comes from the browser. But in fact, it has nothing to do with the browser. The problem comes from the variable assignment node.
yindo commented 2026-02-21 19:09:17 -05:00
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@dosubot[bot] commented on GitHub (Apr 12, 2025):

To address the issue with the variable assignment node causing a client-side exception, you can try the following solutions:

  1. Upgrade Dify: Ensure you are using Dify version 1.2.0 or later, as previous versions had known issues with variable assignment nodes that have been resolved in later updates [1].

  2. Recreate the Workflow: If upgrading doesn't resolve the issue, try recreating the workflow. This approach has been reported to sometimes fix similar issues [1].

These steps should help mitigate the problem with the variable assignment node.

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other

@dosubot[bot] commented on GitHub (Apr 12, 2025): <!-- Answer --> To address the issue with the variable assignment node causing a client-side exception, you can try the following solutions: 1. **Upgrade Dify**: Ensure you are using Dify version 1.2.0 or later, as previous versions had known issues with variable assignment nodes that have been resolved in later updates <sup>[[1]](https://github.com/langgenius/dify/issues/11563)</sup>. 2. **Recreate the Workflow**: If upgrading doesn't resolve the issue, try recreating the workflow. This approach has been reported to sometimes fix similar issues <sup>[[1]](https://github.com/langgenius/dify/issues/11563)</sup>. These steps should help mitigate the problem with the variable assignment node. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* --- <sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/567213d7-5c58-4c38-86d5-cbfcddf7ed27?feedback_type=other)</sup>
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Reference: langgenius/dify#12833
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