Crash on importing the assets "Survival Shooter" and "Space Shooter" in the same project. This issue was also observed while importing 'Tanks'assets with 'Survival Shooter" or "Space Shooter".

Steps To Reproduce :

1. Create a new project.
2. Download and Import 'Survival Shooter' in the project from asset store.
3. Open/Double-click the 'Çomplete Game' Scene.
4. Download and import 'Space Shooter/Tanks" in the same project.
5. Observe the crash.

Note : Checked it with different assets but the crash was only observed in importing the complete games(Survival Shooter, Space Shooter, Tanks).

Working fine on:
2017.3.0f1, 2017.3.0f2, 2017.3.0f3

Reproducible on:
2018.1.0b1, 2018.1.0a7, 2018.1.0a5, 2018.1.0a1

Environment :

Occurring only on Mac