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IF-ELSE node fails when optional file variable is missing in workflow start node #10671

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opened 2026-02-21 18:49:45 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 18:49:45 -05:00
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Originally created by @lrhan321 on GitHub (Mar 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

1.0.0

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

  1. Add a start node with an optional file variable and a required text variable.
  2. Configure an IF-ELSE node with a condition that checks a property of the optional file variable.
  3. Omit the file input when initiating the workflow.

Below is an example:

Image

✔️ Expected Behavior

When the start node contains an optional file variable and no file is provided in the input, the IF-ELSE node should handle the absence of the file variable gracefully. This should allow other conditional branches within the IF-ELSE node to execute correctly without interruption.

❌ Actual Behavior

Image

If the starting node contains an optional file variable and no file is provided, the condition in the IF-ELSE node that checks the size property of the file will prevent the third conditional branch from being triggered, causing the entire workflow to fail. I believe this situation should gracefully handle the missing file variable.

Originally created by @lrhan321 on GitHub (Mar 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 1.0.0 ### Cloud or Self Hosted Self Hosted (Docker) ### Steps to reproduce 1. Add a start node with an optional file variable and a required text variable. 2. Configure an IF-ELSE node with a condition that checks a property of the optional file variable. 3. Omit the file input when initiating the workflow. Below is an example: ![Image](https://github.com/user-attachments/assets/79a10a2a-ef47-4b92-ac10-4953786f71d2) ### ✔️ Expected Behavior When the start node contains an optional file variable and no file is provided in the input, the IF-ELSE node should handle the absence of the file variable gracefully. This should allow other conditional branches within the IF-ELSE node to execute correctly without interruption. ### ❌ Actual Behavior ![Image](https://github.com/user-attachments/assets/a1598c9f-0a5e-4497-999d-325db396aa43) If the starting node contains an optional file variable and no file is provided, the condition in the IF-ELSE node that checks the size property of the file will prevent the third conditional branch from being triggered, causing the entire workflow to fail. I believe this situation should gracefully handle the missing file variable.
yindo added the 🐞 buggood first issue labels 2026-02-21 18:49:45 -05:00
yindo closed this issue 2026-02-21 18:49:45 -05:00
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Reference: langgenius/dify#10671
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