On May 25, 2018, at 12:37 PM, Jack Brindle <email@example.com> wrote:
Graham - did you ever get a response?
This looks to me like you are doing an animation which has completed and is trying to call back to your completion block. For some reason the completion block is mis-formed and is resulting in the execution of bad or non-code. I would look at your animation methods and make sure the completion blocks are formed and set up properly.
And that the block isn't being deallocated prematurely somehow.