iOS 5 - Issue with deleting UITableViewCell with NSFetchedResultsControlller and Cust

i've got uibutton on tableviewcell of app, i'm trying use delete cell. (i know should use standard swipe-to-delete, doesn't fit ux , better). i've used following code try delete cell. no warnings of in xcode, when run app , try delete cell, sigtrap crash , cell not deleted, log says "deleting (null)" opposed deleting (itemname). have suggestions on how fix issue? huge can out. i've been struggling same issue more week, , cannot figure out @ all.

code:

- (ibaction)deletebuttontapped:(id)sender {      uibutton *button = (uibutton *)sender;  uiview *backview = (uiview *)button.superview;  uitableviewcell *cell = (uitableviewcell *)backview.superview;  nsindexpath *indexpath = [self.tableview indexpathforcell:cell];    item *itemtodelete = [self.fetchedresultscontroller objectatindexpath:indexpath];  nslog(@"deleting (%@)", itemtodelete);  [self.managedobjectcontext deleteobject:itemtodelete];  [self.managedobjectcontext save:nil];    [self.tableview deleterowsatindexpaths:[nsarray arraywithobject:indexpath] withrowanimation:uitableviewrowanimationfade];  [self performfetch];

 

do correct index path?

 

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