core data error: 'Can't do regex matching on object 0

i'm creating core data favorite feature. have favorite attribute type boolean in recipe table. there 2 views.

first view user select favorite.
second view display list of favorites selected.

feature works fine when go first view. however, app crashed after go second view , go first view again. following error:

code:

  2012-01-09 18:44:09.455 coredata[1354:12503] coredata: error: serious application error.  exception caught during core data change processing.  bug within observer of nsmanagedobjectcontextobjectsdidchangenotification.  can't regex matching on object 0. userinfo (null)      2012-01-09 18:44:09.457 coredata[1354:12503] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: 'can't regex matching on object 0.'    

my code method in first view toggle favorite attribute 1 or 0:

code:

      - (ibaction)favoritebuttonpressed:(id)sender {                 if (recipe.favorite == 0) {             [favoritebutton setselected:yes];       favoritebuttonselected = 1;       [favoritebuttonimage setimage:[uiimage imagenamed:@"selected.png"] forstate:uicontrolstatenormal];                  self.recipe.favorite = [nsnumber numberwithinteger:1];              }else {              [favoritebutton setselected:no];       favoritebuttonselected = 0;       [favoritebuttonimage setimage:[uiimage imagenamed:@"unselected.png"] forstate:uicontrolstatenormal];                  self.recipe.favorite = [nsnumber numberwithinteger:0];             }          nsmanagedobjectcontext *context = recipe.managedobjectcontext;          nserror *error;       if (![context save:&error]) {        nslog(@"tried save favorite unresolved error %@, %@", error, [error userinfo]);abort();           }      }          

problem did not update database? have searched around , found following method, should include code?

code:

[context refreshobject:recipe mergechanges:no];

can please? thanks!

 

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