steipete/PSTCollectionView — pull request #180 by neoneye (2013-01-24 22:33:21+00:00)
Title: Fixed crash in [PSTCollectionView updateWithItems:] oldToNewIndexMap 

The crash happens because index is out of range.

I populate the collectionview using KVO, like this

[self.collectionView insertItemsAtIndexPaths:indexPaths];

It happened when indexPaths contained 1 element: (row 0, section 0).