human
Solve the following python programming problem given the following code:
def contribute_to_class(self, cls, name) : 
    self.name = self.column = name 
    self.model = cls 
    cls._meta.add_field (self) 
    setattr (cls, name, self) 
    if (not cls._meta.abstract) : 
        if isinstance (name.through, basestring) : 
            def resolve_related_class(field, model, cls) : 
                self.through = model 
                self.post_through_setup (cls) 
add_lazy_relation (cls, self, self.through, resolve_related_class) 
else : 
            self.post_through_setup (cls) 

    
    

    Fix the buggy line: if isinstance (name.through, basestring) :
assistant
#Here is Python program to fix the buggy line: if isinstance (name.

if isinstance (self.through, basestring) :