Quick fix. Not really sure what happens

2014-11-04 07:04:01.888 Oldtimer Rallye[24678:2431401] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0]'
*** First throw call stack:
(
	0   CoreFoundation                      0x02943946 __exceptionPreprocess + 182
	1   libobjc.A.dylib                     0x025cca97 objc_exception_throw + 44
	2   CoreFoundation                      0x0283baf3 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:] + 451
	3   CoreFoundation                      0x0284fc5b +[NSDictionary dictionaryWithObjects:forKeys:count:] + 75
	4   Oldtimer Rallye                     0x00043301 -[AKCollectionViewCell setSelected:] + 881
	5   UIKit                               0x01822d23 -[UICollectionViewCell _setSelected:animated:] + 192
	6   UIKit                               0x0180ba3a __88-[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:]_block_invoke + 141
	7   UIKit                               0x011647af +[UIView(Animation) performWithoutAnimation:] + 82
	8   UIKit                               0x011647f8 +[UIView(Animation) _performWithoutAnimation:] + 40
	9   UIKit                               0x0180b98e -[UICollectionView _dequeueReusableViewOfKind:withIdentifier:forIndexPath:viewCategory:] + 1579
	10  UIKit                               0x0180bc0c -[UICollectionView dequeueReusableCellWithReuseIdentifier:forIndexPath:] + 160
	11  Oldtimer Rallye                     0x0004129a -[AKPickerView collectionView:cellForItemAtIndexPath:] + 298
	12  UIKit                               0x017fcc9a -[UICollectionView _createPreparedCellForItemAtIndexPath:withLayoutAttributes:applyAttributes:] + 258
	13  UIKit                               0x017feb5c -[UICollectionView _updateVisibleCellsNow:] + 4984
	14  UIKit                               0x0180307f -[UICollectionView layoutSubviews] + 263
	15  UIKit                               0x0116ddd1 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 608
	16  libobjc.A.dylib                     0x025e2771 -[NSObject performSelector:withObject:] + 70
	17  QuartzCore                          0x00fb128f -[CALayer layoutSublayers] + 152
	18  QuartzCore                          0x00fa5115 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 397
	19  QuartzCore                          0x00fa4f70 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26
	20  QuartzCore                          0x00f033c6 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 284
	21  QuartzCore                          0x00f0478c _ZN2CA11Transaction6commitEv + 392
	22  QuartzCore                          0x00f04e58 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92
	23  CoreFoundation                      0x028669de __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30
	24  CoreFoundation                      0x02866920 __CFRunLoopDoObservers + 400
	25  CoreFoundation                      0x0285c35a __CFRunLoopRun + 1226
	26  CoreFoundation                      0x0285bbcb CFRunLoopRunSpecific + 443
	27  CoreFoundation                      0x0285b9fb CFRunLoopRunInMode + 123
	28  GraphicsServices                    0x04d5024f GSEventRunModal + 192
	29  GraphicsServices                    0x04d5008c GSEventRun + 104
	30  UIKit                               0x010e28b6 UIApplicationMain + 1526
	31  Oldtimer Rallye                     0x000380cd main + 141
	32  libdyld.dylib                       0x034b6ac9 start + 1
	33  ???                                 0x00000001 0x0 + 1