Repro steps:
1) Open attached project
2) Open scene 'client'
3) Editor crashes

Additional information:
From the editor log I can see, that Unity goes to a loop:

(Filename: C:/buildslave/unity/build/Runtime/BaseClasses/GameObject.cpp Line: 870)
Transform component could not be found on game object. Adding one!

(Filename: C:/buildslave/unity/build/Runtime/BaseClasses/GameObject.cpp Line: 748)
GameObject has multiple Transform components! Merged into single one.

and loops until it crashes. Also in error.log it says:

Unity.exe caused an Access Violation (0xc0000005)
in module Unity.exe at 0033:4013b5a6.

Error occurred at 2015-05-16_043438.
I:\Programs\Unity\Editor\Unity.exe, run by Ray.