Description

When right-clicking on a model and selecting "Generate materials", generated materials will show-up as there, although they aren't. Trying to edit one results in the editor crashing.

To Reproduce

Steps to reproduce the behavior:

1. Import a model
2. Right click on the model and select "generate materials", then "standard"
3. Double click on the material
4. Notice the issue

Expected behavior

Shouldn't crash!

Screenshots

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