How to reproduce:
1. Download attached package and open "PC_Demo" Scene in "Assets\KriptoFX\Realistic Effects Pack v1"
2) Press play
3) Click 'next effect button" 9 times (you should see "character effect 9)
4) Wait till the meteor will collide with the wall
5) Exit Play Mode (Unity editor stop working)

Expected result: Should not crash if exiting from Unity
Actual result: After colliding with the wall and existing Play Mode, Unity editor stops working without Bug report window show

Reproduced with: 5.5.4f1, 5.5.4p4, 5.6.3p2, 2017.1.1f1, 2017.2.0b10, 2017.3.0a7