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Blender crashes due to errors making materials single user
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System Information
Operating system: Win 10 64bit - Intel i7 16GB ram
Graphics card: MSI 1080 Gaming X

Blender Version
version: 2.80 (sub 37), branch: blender2.8, commit date: 2018-12-12 01:18, hash: 16fc62e15f0, type: Release
build date: 11/12/2018, 17:55

Short description of error
create an object with a material. Duplicate it with Alt-D a few times. Select an object and then make it single user Object&Data&material from the Object/Relations menu. Blender will crash

I found this problem because I have been using an earlier version (24th Nov - there were big performance problems after this) all my animated items had been created using Alt-D but I wanted the materials on each character to be changed separately. With this build I could make single user but for some reason what ever I did the Shader Node Tree curve in the graph editor stayed with the material no matter how I tried to recreate the material as a different material. Even deleting and recreating the animated shader node made no difference. I believe these two problems might be related and might possibly be contributary to the performance slowdowns experienced by some with eeVee after Nov 25th.