Reproduction steps:
1) Open user's attached project
2) Open "test" scene
3) Make sure main camera has "test" script attached
4) Build and run project on an Android device
-- Notice that "Object reference not set to an instance of an object" is being printed

5) Change "StructLayout" attribute's "Pack" parameter's value from 1 to 4 on 34th line
6) Build and run project on Android device again
-- Notice that there's no message