Mecanim crash CopyAnimationNodeState - Unity 5.2 or greater

Hello all,
We are unable to move our project onto Unity 5.2 or greater, as we get a mecanim crash as soon as the game scene loads in. We are on 5.1.4 with no problems, game runs fine.. I did notice on opening our project in 5.2+- a few of the animators within prefabs 'lost' their animation controllers. I fixed these up, and began manually disabling animators within the game to try and track down the culprit with no success. Has anyone else seen this? Or know of a solution? Thanks..
Please find the call stack attached to this email.


Unhandled exception at 0x000000014111AA0D in Unity.exe: 0xC0000005: Access violation reading location 0x0000000000000000.

 

This is fixed in 5.2.3p1 - thanks

 

I'm having this crash on iOS