How to reproduce:
1. Open the "CollectAllSceneObjects.rar" project
2. Open the "Mainscene.unity" scene
3. Enter Play mode
4. Exit Play mode
5. Enter Play mode

Actual result: Unity crashes.

Reproducible with: 2018.2.2f1, 2018.2.0b8.
Regression introduced in: 2018.2.0b8.
Not reproducible with: 2018.2.0b7, 2018.3.0a7, 2018.3.0a1, 2018.1.9f1.

Notes:
the issue is not reproducible without "sparkles" GameObject in the hierarchy
Sometimes, Unity may crash on the first Play click (this crash is also reported) - to fix that, make any changes and save the project, then re-open it.

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Fixed in 2018.2.5f1.