Notice: Undefined index: user in /home/www/ on line 4

Fatal error: Uncaught 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 in /home/www/ Stack trace: #0 /home/www/ PDO->query('update tbl_admi...') #1 {main} thrown in /home/www/ on line 6