The iphone app crashing after the FbRequest method


I have made an iPhone App which has a "loginwithFacebook" button , the login procedure is working fine . but App crashes after passing through the FBRequest method "- (void)request:(FBRequest *)request didLoad:(id)result " and "- (void)connectionDidFinishLoading:(NSURLConnection *)connection " .

I tried to put some break point in these methods. Then , I was amaized to see that App is working After some delay with that i made putting the break points.

Is it something related to loading the connection or Delay of the content loading from Fbrequest method ???

please help me ..

[NSNull lowercaseString] which means your one string is null and you are trying to apply lowercaseString method to that string. keep a null check condition before this method call or you can check why this string is null.