magento 2.1.5 unable to add product getting mysql error

Question

i am getting below error while adding product in magento 2.1.5

SELECT `e`.* FROM `catalog_category_entity` AS `e` WHERE (())

2 exception(s): Exception #0 (Zend_Db_Statement_Exception): SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '))' at line 1, query was: SELECT e.* FROM catalog_category_entity AS e WHERE (()) Exception #1 (PDOException): SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '))' at line 1

Exception #0 (Zend_Db_Statement_Exception): SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '))' at line 1, query was: SELECT e.* FROM catalog_category_entity AS e WHERE (())

Answer 1

Just remove an empty WHERE (()) because it is wrong syntax for MySQL. In case you don't know from where it comes, add more details: when and where that error appears.