Importing the 6.1 version of ProBuilder crashes Scene View rendering and throws NRE in the console

Steps to reproduce:

1. Have a clean project without ProBuilder
2. Import ProBuilder from packman
3. Observe the console

Actual results: Errors are thrown and the scene view rendering is broken

Expected results: the package is imported normally

Reproducible with versions: 6.1.x

Not reproducible with versions: 6.0.x

Can’t test with versions: 

Tested on (OS): Win, Mac

Notes:

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