human
Solve the following python programming problem given the following code:
@ property 
def drilldown_map(self) : 
    def err_item(val, name, val_count, next_list = None) : 
        ret = { 
            'val' : val, 
            'text' : '{} ({})'.format (name, val_count), 
} 
        if next_list : 
            ret ['next'] = next_list 
return ret 
data = PillowError.objects.values ('pillow', 'error_type').annotate (num_errors = Count ('id')) 
    data_map = defaultdict (list) 
    pillow_counts = defaultdict ((lambda : 0)) 
    for row in data : 
        pillow = row ['pillow'] 
        error = row ['error_type'] 
        count = row ['num_errors'] 
        data_map [pillow].append (err_item (error, error, pillow)) 
        pillow_counts [pillow] += count 
return [err_item (pillow, pillow.split ('.') [(- 1)], pillow_counts [pillow], errors) for (pillow, errors) in data_map.items ()] 

    
    

    Fix the buggy line: data_map [pillow].append (err_item (error, error, pillow))
assistant
#Here is Python program to fix the buggy line: data_map [pillow].

data_map [pillow].append (err_item (error, error, count))