Larian Studios Forums Divinity: Original Sin 2 - The Modding Dungeon Divinity - Original Sin 2 - Modding Troubleshooting Not responding

It looks like the performance problems in the filter of ANY edit window of NPCs comes from this error:

[22-09-2017 07:48:45:586][..\MSpeakerGroupCollection.cpp 23 EoCPlugin::MSpeakerGroupCollection::ToString]: Unknown speaker group with UUID 4bdd9996-42f7-47dc-9a2b-1d9bfa2e738f

There are several hundred(!) lines of this error in the error.txt file.