This happens almost 100% on a MBP/MaxOS, (2.3GHz Quad-Core Processor ,8GB 2133MHz LPDDR3 memory), also happens in a lower frequency on PC/Windows, (nvidia 1080, 64 memory) 

Steps to Reproduce

Create any material, switch the default (sphere) viewer to others, say the Cube, the engine will crash.

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Cannot Reproduce
Affects Versions4.20.3
CreatedDec 17, 2018
ResolvedMar 23, 2020
UpdatedMar 23, 2020