I think this code lines are not the source of the reported issue: just in the preceding line, this check is already in place:

if event.usage:

Please note that we support streaming with our stream_outputs parameter:

• if True, we call generate_stream and call the model with stream=True
• if False, we call generate, and the model is not called with stream=True

And according to OpenRouter docs, response.usage can only be None when passing stream=True, that is, when stream_outputs is True, and therefore when we call generate_stream. We don't call generate when streaming outputs.

Could you please provide an example raising the error in the reported issue:

• #1401

Thanks!

Just did a minor refactoring.