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10 Dec 2012, 09:47
Markus Dommann (1 post)

I opened RecipesV1 with Xcode 4.5.2 compiled and run, pressed the button ‘+’ and got this:

CoreData: error: Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. *** -[__NSPlaceholderArray initWithObjects:count:]: attempt to insert nil object from objects[0] with userInfo (null)

I could fix this by checking the indexPaths before using them in controller:didChangeObject: in PPRMasterViewController.m

NSArray *newArray = nil;
if (newIndexPath) {
  newArray = [NSArray arrayWithObject:newIndexPath];    
NSArray *oldArray = nil;
if (indexPath) {
  oldArray = [NSArray arrayWithObject:indexPath];

This way the app doesn’t crash anymore on adding the first recipe or canceling the same addition.

01 Feb 2013, 17:16
Dave Zohrob (1 post)

Thanks – you saved me a lot of frustration.

Author, this should be included in the code!

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