human
Solve the following python programming problem given the following code:
@ pytest.fixture (scope = 'module') 
def not_tracked_server(request) : 
    (ps, ser) = gen_server ((PORT + 3), tracker = None, processor = TProcessor) 
    time.sleep (0.15) 
    def fin() : 
        if ps.is_alive () : 
            ps.terminate () 
request.addfinalizer (ser) 
    return ser 

    
    

    Fix the buggy line: request.addfinalizer (ser)
assistant
#Here is Python code to fix the buggy line: request.

request.addfinalizer (def fin()