How to reproduce:
1. Open the "mono_crash,zip" project
2. Open the "test_scene.unity" scene
3. Press Play

Actual result: Unity crashes.

Reproducible with:2019.2.0a4, 2019.1.0b2, 2018.3.5f1, 2018.3.0b7.
Regression introduced in: 2018.3.0b7.
Not reproducible with: 2018.3.0b6, 2018.3.0a1, 2018.2.20f1, 2018.1.9f2.

Notes:
The crash happens on line "Test();" Preloadable.cs: 8.
Crash happens because mono fails to catch null reference exception in line "activeModulePrefabs [i].EnsurePreloaded ();" ModuleManager.cs: 13.

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Fixed in 2019.2.0a8, 2019.1.0b7, 2018.3.11f1.