App crashing in UIPopoverPresentationController but no explicit popovers?

Question

My app (iOS 8 only) has been rejected due to a crash when IAP are attempted. I've tried pretty much every incantation of the purchase process in an AdHoc build but cannot reproduce a crash. Looking at the crash log that the review team attached, I am seeing a very weird stack trace in the last exception backtrace. The crash looks to be involving UIPopoverController, however my app, though universal, does not explicitly or implicitly display popovers anywhere. Does anyone have any idea what might trigger the activity that is causing this crash? What might cause my app to display popovers when the review team is looking at it only?

Last Exception Backtrace:
0   CoreFoundation                0x186d52084 __exceptionPreprocess + 132
1   libobjc.A.dylib               0x1977a40e4 objc_exception_throw + 60
2   UIKit                         0x18bc0aee0 -[UIPopoverPresentationController presentationTransitionWillBegin] + 2464
3   UIKit                         0x18b7d27d8 __71-[UIPresentationController _initViewHierarchyForPresentationSuperview:]_block_invoke + 1324
4   UIKit                         0x18b7d1310 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke + 212
5   UIKit                         0x18b557388 _applyBlockToCFArrayCopiedToStack + 356
6   UIKit                         0x18b4c8e4c _afterCACommitHandler + 532
7   CoreFoundation                0x186d0a388 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 32
8   CoreFoundation                0x186d07314 __CFRunLoopDoObservers + 360
9   CoreFoundation                0x186d076f4 __CFRunLoopRun + 836
10  CoreFoundation                0x186c35664 CFRunLoopRunSpecific + 396
11  GraphicsServices              0x18fd435a4 GSEventRunModal + 168
12  UIKit                         0x18b53a984 UIApplicationMain + 1488

Answer 1

Not sure if it's the same cause as the original question, but I have the exact same error and the issue was using a UIAlertController with an ActionSheet style, presenting it worked fine on iPhone but iPad requires a sourceview to be set - https://stackoverflow.com/a/24233937/285694