How to reproduce:
1. Open user-submitted project (ML Shader play 2.zip)
2. Open the SampleScene
3. Note the immediate ArgumentExceptions in the Console window
4. Enter Play Mode and leave it running for a while

Expected result: the Editor does not eventually crash
Actual result: the Editor eventually crashes

Reproducible with: 2018.4.18f1, 2019.3.4f1, 2020.1.0a26, 2020.2.0a1
Could not test with: 2017.4.37f1

Reproducible with package versions: 0.1.7, 2.3.0

Notes:
Reproducible with any invalid shader(e.g. a material renamed to have a .hlsl extension)
The crash occurs after around 1000-5000 error messages are printed in Play Mode, lesser number with newer versions of Unity