ios - addObject in NSMutableArray error -

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i trying show or hide buttons actions can take contact depending on whether data present, i.e. there phone number or facebookid. following code compiles crashes on buttonstohide line.

nsmutablearray *buttonstoshow = [nsmutablearray arraywithobjects:self.facebookbutton,self.callbutton, self.smsbutton, self.emailbutton, self.deletebutton, nil];    nsmutablearray *buttonstohide = [nsmutablearray array];  nslog(@"facbook id is:%@",self.contact.facebookid);  if (self.contact.facebookid == nil) {     [buttonstoshow removeobject:self.facebookbutton];     //following line crashes , shows in green     [buttonstohide addobject:self.facebookbutton]; }

would appreciate suggestions on causing crash.

it's isn't crashing on second array allocation, on first, , crash caused 1 elements in initialization being nil.

nsmutablearray *buttonstoshow; if (self.facebookbutton && self.callbutton && self.smsbutton && self.emailbutton && self.deletebutton) {     buttonstoshow = [nsmutablearray arraywithobjects:self.facebookbutton,self.callbutton, self.smsbutton, self.emailbutton, self.deletebutton, nil];   } else {     buttonstoshow = [nsmutablearray array];     nslog(@"didn't initialize array because placing nil objects in array causes crash"); }

are buttons iboutlets? possibly not hooked up?


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