Steps to reproduce:

1) Open Unity
2) Observe the crash

Expected result: No crash when opening Unity
Actual result: Crash on start

Reproduced with:
2018.3.0a6

Not reproduced with:
2018.3.0a5

Note:
Doesn't happen every time.
Always happens after installing this version and launching it
If this version encountered, keep Unity closed for ~1h and then try to open it. Usually, crash

Reproduced using Windows 10 and macOS machines
-----------------------------------------------
Fixed in:
2018.3.0a10