human
Solve the following python programming problem given the following code:
def __call__(self, bugsnag) : 
    def middleware(notification) : 
        if self.before : 
            ret = self.before (notification) 
            if (ret is False) : 
                return 
bugsnag (notification) 
        if self.after : 
            self.after (notification) 
return bugsnag 

    
    

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

return def middleware(