Class Object is always null - ios

Question

This is the method when my app complete the downloading with contact which is coming from server. In for loop I am using AIContactParsarModal class and using dictionary I am setting the objects, but every time object value is null.
Thanks for the help and any help will be appreciable. Here is my code.
- (void)donewithContact {
self.allPersonDetailsDict = [[NSMutableDictionary alloc]initWithCapacity:1];
NSMutableArray *allKeysArray = [[NSMutableArray alloc] init];
NSString *prefix;
NSString *searchContactString = [[NSUserDefaults standardUserDefaults] objectForKey:#"AdvanceSearch"];
if ([searchContactString isEqualToString:#"SpecialSearch"]) {
[self.allPersonDetailsDict removeAllObjects];
}
if (getContactArray.count == 0 ){
[noContactLabel setHidden:NO];
} else {
for (AIContactParsarModal *contact in getContactArray) {
NSLog(#"contact LAST NAMES ARE %#",contact.lastName);
prefix = [[contact.lastName substringWithRange:NSMakeRange(0, 1)] uppercaseString];
if ([allKeysArray containsObject:prefix]) {
NSMutableArray *conatctsWithPrefix = [_allPersonDetailsDict objectForKey:prefix];
[conatctsWithPrefix addObject:contact];
} else {
[allKeysArray addObject:prefix];
NSMutableArray *conatctsWithPrefix = [[NSMutableArray alloc] initWithObjects:contact,nil];
[self.allPersonDetailsDict setObject:conatctsWithPrefix forKey:prefix];
NSLog(#"conatctsWithPrefix %#",conatctsWithPrefix);
}
}
[noContactLabel setHidden:YES];
}
NSLog(#"All Names First characters are:%#", allKeysArray);
[self.contactTableView reloadData];
[HUD hide:YES];
}

Answer 1

May be you are getting null value in contact by which you are getting null in conatctsWithPrefix
first print values stored in contact.