System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.06
Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-22 22:24, hash: rB010c1370aff6
Worked: version: 2.91.0 Alpha, branch: master, commit date: 2020-08-15 17:06, hash: rB2c61c3d733cf (could be later versions that work but didn't download any other build bot builds since then)
Short description of error
Blender crashes when accessing the grease pencil material properties panel
Exact steps for others to reproduce the error
Add Grease Pencil monkey primitive. Go to material properties panel for monkey primitive and then you should get a crash.
