title: Getting EXC_BAD_ACCESS KERN_PROTECTION_FAILURE
body: <p>I'm getting EXC_BAD_ACCESS KERN_PROTECTION_FAILURE sometimes in the following method:</p>
  
  <pre><code>+ (NSString *) UTCStringWithDate:(NSDate *)date {
      NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
      NSTimeZone *timeZone = [NSTimeZone timeZoneWithName:@"UTC"];
      NSLocale *enLocale = [[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"];
  
      [dateFormatter setLocale:enLocale];
      [dateFormatter setTimeZone:timeZone];
      [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"];
      NSString *dateString = [dateFormatter stringFromDate:date];
      return dateString;
  }
  </code></pre>
  
  <p>What could be going wrong? Please help!</p>