I think it happens because callback method from this library are performed in background thread, try to wrap you code with dispatching on main thread, it should help:
dispatch_async(dispatch_get_main_queue(), ^{
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
mainTabViewController *objSec=[storyboard instantiateViewControllerWithIdentifier:@"passID"];
[self.navigationController pushViewController:objSec animated:YES];
}];