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openai_api_compatible] Error: PluginInvokeError: {"args":{"description":"[models] Error: 'NoneType' object is not iterable"},"error_type":"InvokeError","message":"[models] Error: 'NoneType' object is not iterable"} #292

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opened 2026-02-16 10:18:50 -05:00 by yindo · 1 comment
yindo commented 2026-02-16 10:18:50 -05:00
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Originally created by @wbext on GitHub (May 18, 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

Image Image

Could any expert tell me how to fix this bug?

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

Originally created by @wbext on GitHub (May 18, 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 <img width="243" alt="Image" src="https://github.com/user-attachments/assets/29eef5a3-d1e3-4286-b515-f4263b097235" /> <img width="191" alt="Image" src="https://github.com/user-attachments/assets/a12556f1-0621-4249-98f2-55890b58e2f6" /> Could any expert tell me how to fix this bug? ### ✔️ Expected Behavior _No response_ ### ❌ Actual Behavior _No response_
yindo closed this issue 2026-02-16 10:18:50 -05:00
yindo commented 2026-02-16 10:18:51 -05:00
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@dosubot[bot] commented on GitHub (May 18, 2025):

The error you're encountering, 'NoneType' object is not iterable, typically occurs when a function or method attempts to iterate over a variable that is None. In the Dify codebase, this issue is related to the _run method of the IterationNode class, where the code checks if the variable is an instance of NoneVariable or if its value length is zero [1].

To address this issue, you can:

  1. Check the Input to the '知识检索 2' Step: Ensure that the input variable to the '知识检索 2' step is correctly initialized and not None. This step involves retrieving knowledge from a database, and if the input query or variable is None, it could lead to this error.

  2. Debug the Workflow: Use logging or debugging tools to trace the values of variables passed to the '知识检索 2' step. Verify that the input is valid and correctly formatted.

  3. Review the Code Handling 'NoneVariable': Examine the code where NoneVariable is defined and used. Ensure that any conditions leading to a None value are handled appropriately, possibly by adding checks or default values.

  4. Update Dependencies: Ensure that you are using compatible versions of the 'OpenAI-API-compatible' package and other dependencies. Sometimes, version mismatches can lead to unexpected behavior.

By following these steps, you should be able to identify and resolve the issue causing the NoneType error in your workflow.

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 (May 18, 2025): <!-- Answer --> The error you're encountering, `'NoneType' object is not iterable`, typically occurs when a function or method attempts to iterate over a variable that is `None`. In the Dify codebase, this issue is related to the `_run` method of the `IterationNode` class, where the code checks if the `variable` is an instance of `NoneVariable` or if its value length is zero <sup>[[1]](https://github.com/langgenius/dify/blob/main/api/core/workflow/nodes/iteration/iteration_node.py)</sup>. To address this issue, you can: 1. **Check the Input to the '知识检索 2' Step**: Ensure that the input variable to the '知识检索 2' step is correctly initialized and not `None`. This step involves retrieving knowledge from a database, and if the input query or variable is `None`, it could lead to this error. 2. **Debug the Workflow**: Use logging or debugging tools to trace the values of variables passed to the '知识检索 2' step. Verify that the input is valid and correctly formatted. 3. **Review the Code Handling 'NoneVariable'**: Examine the code where `NoneVariable` is defined and used. Ensure that any conditions leading to a `None` value are handled appropriately, possibly by adding checks or default values. 4. **Update Dependencies**: Ensure that you are using compatible versions of the 'OpenAI-API-compatible' package and other dependencies. Sometimes, version mismatches can lead to unexpected behavior. By following these steps, you should be able to identify and resolve the issue causing the `NoneType` error in your workflow. <!-- 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/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/71d51234-3ca9-42d0-aab2-093f3e712938?feedback_type=other)</sup>
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Reference: langgenius/dify-official-plugins#292
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