Uiapplication SendEvent crash

I am developing sample application where i am subclassing UIApplication and overriding sendEvent function.Everything works good but however sometime i am getting exception in the function, is their any possibility that [UIApplication SendEvent] may through exception??..following is my code..

 (void)sendEvent:(UIEvent *)event 
{
    [super sendEvent:event]; 


//Some other things just checking for type of event..etc...

}  

I get exception just after calling [super sendEvent:event]; .