INSERT INTO `website_categorization`.`category_keyword` (
NULL , '18', 'free mail', ''
NULL , '18', 'web email free', ''
#1062 - Duplicate entry '18-free mail' for key 'ID_Category'
You already have a row in your database with the values '18' and 'free mail'. You can't have two such rows because of the unique constraint. You have some choices:
DELETE FROM yourtable WHERE ID_Category = '18' AND Keyword = 'free mail'.
INSERT IGNOREto ignore the error.
INSERTto replace the old row with the new row.