Hi @per,
Thanks for bringing this up. Though it looks like the error is related to the AI Agent favicon, not the failed Runs.
The most likely cause is incorrect variable references in the Run Workflow block. Here are a couple of resources that might help:
If you can share some screenshots or a Loom of your setup, including the Run Workflow block configuration and a sample run in the Debugger, that would help us see what’s going on.