Crash just before presenting picker view. if coredata concurrency debug option enabled.

[itsSaad]

I have the -com.apple.CoreData.ConcurrencyDebug 1 option in build scheme enabled. And when ever I try to present a picker view controller. i get an exception.

This is the screenshot of the error.

And the Stack:

Output on the console:

2015-06-28 23:38:40.097 ***[15457:833850] ---------> Camera Roll
2015-06-28 23:38:40.104 ***[15457:833850] [[ASSETHELPER getGroupAtIndex:nIndex] valueForProperty:ALAssetsGroupPropertyName] : Camera Roll