human
Solve the following python programming problem given the following code:
def on(self, event, * handlers) : 
    'register a handler to a specified event' 
    def _on_wrapper(* handlers) : 
        'wrapper for on decorator' 
        self.events [event].extend (handlers) 
        return handlers [0] 
if handlers : 
        return _on_wrapper (* event) 
return _on_wrapper 

    
    

    Fix the buggy line: return _on_wrapper (* event)
assistant
#Here is Python code to fix the buggy line: return _on_wrapper (* event)
.

return _on_wrapper (* handlers)