openclaw - 💡(How to fix) Fix [Bug] 2026.4.1: "Cannot read properties of undefined (reading 'bind')" with Anthropic API key [1 comments, 1 participants]

TL;DR

Copy the .result and .controller properties from the original SDK stream onto the async generator in the usage-tracking wrapper to fix the crash.

Guidance

• Identify the usage-tracking wrapper code in OpenClaw 2026.4.1 and locate the lines where the async generator is returned.
• Verify that the downstream code is calling .result.bind(stream) on the async generator, which is causing the crash.
• Apply the fix by copying the .result and .controller properties from the original SDK stream onto the async generator before returning it.
• Test the fix by making API calls and checking if the gateway crashes repeatedly.

Example

// Example of copying properties onto the async generator
const originalStream = // get the original SDK stream
const asyncGenerator = // get the async generator
asyncGenerator.result = originalStream.result;
asyncGenerator.controller = originalStream.controller;
return asyncGenerator;

Notes

This fix assumes that the usage-tracking wrapper is the cause of the issue and that copying the properties onto the async generator will resolve the crash. However, this may not apply to users routing through OpenRouter, as they may use a different streaming path.

Recommendation

Apply the workaround by copying the .result and .controller properties onto the async generator, as this is a targeted fix for the identified issue.