select photo cause crash when camera roll has only 1-3 images on iOS 9

[D-Wang]

I run the demo in the project, when camera roll has very few photo, select will cause crash on iOS 9, iPhone 6s
Here is the crash log and call stack
2015-10-10 14:48:19.865 Example[37983:1364492] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'layout attributes for supplementary item at index path (<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}) changed from <UICollectionViewLayoutAttributes: 0x7f874a7708d0> index path: (<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}); element kind: (UICollectionElementKindSectionHeader); frame = (46.7011 5; 47 119); hidden = YES; zIndex = 1; to <UICollectionViewLayoutAttributes: 0x7f874a45f6d0> index path: (<NSIndexPath: 0xc000000000000016> {length = 2, path = 0 - 0}); element kind: (UICollectionElementKindSectionHeader); frame = (46.7011 5; 47 271); hidden = YES; zIndex = 1; without invalidating the layout'
*** First throw call stack:
(
0 CoreFoundation 0x0000000109be5f65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010b9a4deb objc_exception_throw + 48
2 CoreFoundation 0x0000000109be5dca +[NSException raise:format:arguments:] + 106
3 Foundation 0x000000010a02eae2 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 198
4 UIKit 0x000000010ad8cafd __45-[UICollectionViewData validateLayoutInRect:]_block_invoke + 921
5 UIKit 0x000000010ad8c240 -[UICollectionViewData validateLayoutInRect:] + 3067
6 UIKit 0x000000010ad3c83e -[UICollectionView layoutSubviews] + 196
7 UIKit 0x000000010a5dd11c -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 710
8 QuartzCore 0x000000010c71036a -[CALayer layoutSublayers] + 146
9 QuartzCore 0x000000010c704bd0 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366

[lbrndnr]

Right, will fix this asap

[lbrndnr]

The last tag fixes this issue, thanks for reporting!