99c87fbf18
I'm not sure when this stopped working. The function in question is quite confusing since it's called twice with two different purposes. Fixing the exception is simple though. Just checking the data type for "None" prevents changing the data type to one that's invalid given the context. I didn't find a simple way to add an error message though. Pull Request: https://projects.blender.org/blender/blender/pulls/138287
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