human
Solve the following python programming problem given the following code:
@ pytest.fixture 
def mock_profile_builder() : 
    counter = itertools.count () 
    next (counter) 
    username_to_profile = { 
        
} 
    def _build_mock_profile(username = 'username', age = 30, id = None, location = 'San Francisco, CA', **kwargs) : 
        if (username in username_to_profile) : 
            return username_to_profile [username] 
if (id is None) : 
            id = next (counter) 
mock_profile = mock.MagicMock (id = (id or next (counter)), location = location, age = age, username = username, ** kwargs) 
        username_to_profile [username] = mock_profile 
        return mock_profile 
return counter 

    
    

    Fix the buggy line: return counter
assistant
#Here is Python code to fix the buggy line: return counter
.

return def _build_mock_profile(