AI manager error

Wappler General Need Help
1

Wappler 7.9.3
macOS 15.7.5
Nodejs Project

Openrouter AI API connected to bedrock ai api throws this error.
Same API working fine in openclaude, jcode etc.

image
image324×408 15.4 KB

3

Does this error happen after specific tool calls, happens it always after the first response or is it more random?

4

It happens always

5

@Priya_Sharma I was facing the same issue. If you are using the Wappler AI Manager with OpenRouter (or certain OpenAI-compatible models) and encountering a silent crash or an error stating TypeError: Cannot read properties of undefined (reading 'filter'), here is why it happens and how to fix it.

The Cause:
The bug occurs in Wappler's internal chatClient.js streaming file. The code expects the incoming AI payload to contain a tool_calls property. When a model returns a standard text response without any tool execution, this property is completely missing (undefined). Wappler then tries to execute .filter() on it and crashes.

How to Fix It:

  1. Close Wappler.

  2. Locate the chatClient.js file on your machine:

    • Windows: C:\Users\<YourUser>\AppData\Local\Wappler\resources\app\Shared\DMXzone\dmxAppCreator\UI\ai\chatClient.js

    • macOS: Right-click Wappler in Applications -> Show Package Contents -> /Contents/Resources/app/Shared/DMXzone/dmxAppCreator/UI/ai/chatClient.js

  3. Find line 236, which currently looks like this:

    javascript

    snapshot.tool_calls = snapshot.tool_calls.filter(tc => tc != null);

  4. Change it to include an empty array fallback using optional chaining/logical OR:

    javascript

    snapshot.tool_calls = (snapshot.tool_calls || []).filter(tc => tc != null);

  5. Save the file and restart Wappler.

6

Thanks for the solution, will fix it for the next update. The AI solution works but his description about the cause isn't. It is actual a bug in the OpenRouter API which sends a duplicate finish_reason chunk in the stream. On finish the tool_calls array is removed from the snapshot, due to the duplicate finish it is called a second time after it was removed causing the error in Wappler.

1 Like