The crash might be caused by the Property Matrix simultaneously loading a large number of textures for editing.
If you’re still experiencing similar issues, you can try my plugin, AssetProcessor. It’s a versatile bulk-editing tool for asset UProperties, including those only modifiable via C++. The plugin modifies matching assets sequentially instead of loading all textures at the same time.
Below are the YouTube video link and FAB link—hope this helps! 
