App runs if I activate breakpoints, fails otherwise - ios

Question

I have an app that uses sockets to send login information to a server and receives a response in form of a contact list. This is the main method for processing responses from server:
-(void) stream:(NSStream*)theStream handleEvent:(NSStreamEvent)streamEvent {
switch(streamEvent) {
case NSStreamEventOpenCompleted:
NSLog(#"Stream opened");
break;
case NSStreamEventHasBytesAvailable:
if(theStream == inputStream) {
uint8_t buffer[8196];
int len;
while([inputStream hasBytesAvailable]) {
len = [inputStream read:buffer maxLength:sizeof(buffer)];
if(len>0) {
NSString *output = [[NSString alloc] initWithBytes:buffer length:len encoding:NSUTF8StringEncoding];
if(output != nil) {
NSLog(#"server said: %#", output);
id jsonOutput = [self createJsonFromString:output];
if([[jsonOutput objectForKey:#"msg_type"] isEqualToString:#"LoginResponse"])
{
[self sendMessage:[self createAddressBookRequestJsonData]];
} else if ([[jsonOutput objectForKey:#"msg_type"] isEqualToString:#"GetAddressBookResponse"])
{
id contactList = [jsonOutput objectForKey:#"contact_list"];
for(id contactListItem in contactList)
{
XYZAddressBookEntry *newEntry = [[XYZAddressBookEntry alloc] init];
newEntry.firstName = [contactListItem objectForKey:#"FirstName"];
newEntry.lastName = [contactListItem objectForKey:#"LastName"];
newEntry.displayName = [contactListItem objectForKey:#"DisplayName"];
newEntry.softphoneNumber = [contactListItem objectForKey:#"SoftphoneNumber"];
newEntry.homeNumber = [contactListItem objectForKey:#"HomeNumber"];
newEntry.mobileNumber = [contactListItem objectForKey:#"MobileNumber"];
newEntry.businessNumber = [contactListItem objectForKey:#"BusinessNumber"];
newEntry.name = [contactListItem objectForKey:#"Name"];
newEntry.phoneAddress = [contactListItem objectForKey:#"PhoneAddress"];
[self.entryList addObject:newEntry];
}
[self.tableView reloadData];
}
}
}
}
}
break;
case NSStreamEventHasSpaceAvailable:
break;
case NSStreamEventEndEncountered:
[theStream close];
[theStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
break;
case NSStreamEventErrorOccurred:
NSLog(#"Can not connect to the host!");
break;
default:
NSLog(#"Unknown event:");
} }
I always get a correct output in my log, so everything goes smooth, but if I don't set a breakpoint right after NSLog(#"server said: %#", output), it will not enter the if else code block. What am I missing?
By the way, I'm a newbie to this, started using objective-c just 2 weeks ago.