Works on android phone but not iPad 5th gen

Hello, I have quite a large AR project that worked fine before we made slight updates to it. The updates were basically duplicating a very small 3D model and then giving it a different texture map.

Since this update the project no longer works. Its basically 2 rooms, each grouped so that you can swap the rooms at a touch of a button turning them on and off. It loads in ok but as soon as the 2nd room is displayed it quits out. This is while using the iPad 5th gen. If I try it on my android mobile phone it works fine.

Is this a common thing?. Do you think its due to the iPad being older than the phone?. I realise this is a “how long is a piece of string question”