Error after converting to rigify rig

[Fab 3DX]

The error message in the attached picture shows up everytime I try to convert my model to rigify.
I’m using the build from today 30.03.21. This doesn’t happen in the 1.5.1c with the exact same model.
I also checked if there is a rig called “rig” in my collection, but there isn’t one.

[Thomas Larsson]

I cannot reproduce this behaviour, but I can see where it happens and it shouldn’t happen anymore. A few other problems showed up when I tested this, and they should be fixed as well.