Crash, branch swift 2.0

[richardtop]

When I tried to pull up collection view on 4S

*** Assertion failure in -[UICollectionView _endItemAnimations], /SourceCache/UIKit/UIKit-3318.16.21/UICollectionView.m:3917
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of items in section 0. The number of items contained in an existing section after the update (10) must be equal to the number of items contained in that section before the update (5), plus or minus the number of items inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of items moved into or out of that section (0 moved in, 0 moved out).'
*** First throw call stack:
(0x2b38b5f7 0x38bfdc77 0x2b38b4cd 0x2c05faa9 0x2e9ed3ed 0x2e9f634f 0x5d43e0 0x5db138 0x5db2c0 0x5dd508 0x5db470 0x5c3fc8 0x5c40c0 0x2e9b098f 0x2e85f47d 0x2ec74171 0x2e828cf5 0x2e826c6f 0x2e85d86d 0x2e85d13d 0x2e8338c5 0x2eaa7373 0x2e832307 0x2b351fd7 0x2b3513eb 0x2b34fa69 0x2b29cb31 0x2b29c943 0x3267c051 0x2e8926f1 0x3bcd8 0x39199aaf)
libc++abi.dylib: terminating with uncaught exception of type NSException