If you have ProBuilder installed and attempt to create a new shape with it, multiple exceptions occur and the shape is not created.

This was caused by a change to core than went in at 2019.1.0a7, it is not dependent on package version.

1. Install Unity
2. Open the attached project
3. Go to Tools > ProBuilder > ProBuilder Window
4. Select "New Shape" from the ProBuilder Window
5. Select Build Cube

Expected Result:
A cube is created.

Actual Result:
Multiple exceptions occur and a cube is not created.

Tested on Windows with package versions 3.0.9 and 3.0.8

Occurs on 2019.1.0a7, 2019.1.0a8, 2019.1.0a9, 2019.1.0a11

Does not occur on 2018.3.0b11, 2019.1.0a5, 2019.1.0a6