IL2CPP results in crash on iOS

I’m working on an iOS game and everything works as expected in the Unity editor. When I build the game via Xcode using Mono2x it also works as expected.

However, due to Apple’s requirements for 64 bit architecture, I have to use IL2CPP. This results in a crash whenever a collision occurs.

I have attached a screenshot of my player settings and the stack trace via Xcode.

Any advice would be greatly appreciated, this is quite frustrating.

I’m using Unity build (5.1.0f3)

For anyone experiencing an issue like this, I found the solution.

My script had the following method:
functionOnCollisionEnter(collision) {

changing this to the following fixed the issue:
functionOnCollisionEnter (col : Collision){