human
Solve the following python programming problem given the following code:
def on_click(self, callback, remove = False) : 
    " Assign a callback to click events propagated
        by clicking on point(s) in the Plotly graph.

        Args:
            callback (function): Callback function this is called
                on click events with the signature:
                callback(widget, hover_obj) -> None

                Args:
                    widget (GraphWidget): The current instance
                    of the graph widget that this callback is assigned to.

                    click_obj (dict): a nested dict that describes
                    which point(s) were clicked on.

                    click_obj example:
                    [
                        {
                            'curveNumber': 1,
                            'pointNumber': 2,
                            'x': 4,
                            'y': 14
                        }
                   ]

            remove (bool, optional): If False, attach the callback.
                If True, remove the callback. Defaults to False.

        Returns:
            None

        Example:
        ```
        from IPython.display import display
        def message_handler(widget, msg):
            display(widget._graph_url)
            display(msg)

        g = GraphWidget('https://plot.ly/~chris/3375')
        display(g)

        g.on_click(message_handler)
        ```
        " 
    self._handle_registration ('click', callback, callback) 

    
    

    Fix the buggy line: self._handle_registration ('click', callback, callback)
assistant
#Here is Python program to fix the buggy line: self.

self._handle_registration ('click', callback, remove)