Fix magento product's categories tree

categories_tree.sql

CREATE TABLE catalog_category_entity_tmp LIKE catalog_category_entity;
INSERT INTO catalog_category_entity_tmp SELECT * FROM catalog_category_entity;

UPDATE catalog_category_entity cce
SET children_count =  
(
SELECT count(cce2.entity_id) as children_county
FROM catalog_category_entity_tmp cce2
WHERE PATH LIKE CONCAT(cce.path,'%') 
); 

DROP TABLE catalog_category_entity_tmp;