Make a symbolic breakpoint at UICollectionViewFlowLayoutBreakForInvalidSizes
You can systematically solve this by doing this:
Also, you should share your complete error, so that I can lead you to more specific issue. My thinking is that you have some sort of autoLayout issue in your UICollectionView
On the left of your project, click the Break Point navigator
Next click on the plus button on the bottom left and click Add Symbolic BreakPoint
Then you will be shown a popup. Add UICollectionViewFlowLayoutBreakForInvalidSizes in there like so
After this, just hit enter(on keyboard) and click anywhere
Run your code and see where the project stops