How to reproduce:
1. Open the attached project and make sure Perforce is selected as the Version Control
2. Close the Editor
3. Run build.sh script (Paths needs to be changed according to your machine)
4. Check the generated UnityEditor.log file

Actual result: Perforce Plugin crashes with ArgumentOutOfRangeException.
Expected result: Perforce Plugin doesn't crash.

Reproducible with: 2019.3.1f1, 2019.3.0f6, 2019.3.0b11.
Regression introduced in: 2019.3.0b11.
Not reproducible with: 2020.1.0a22, 2019.3.0b10, 2019.2.20f1, 2018.4.17f1.

Notes:
- Full error:
ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index