Fatal error: Uncaught mysqli_sql_exception: 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 '-4, 4' at line 1 in /home/kir301758/public_html/tks-ind.co.jp/php/improvement.php:365 Stack trace: #0 /home/kir301758/public_html/tks-ind.co.jp/php/improvement.php(365): mysqli_query() #1 /home/kir301758/public_html/tks-ind.co.jp/example/index.php(36): Improvement->getImprovementDataForCategory() #2 {main} thrown in /home/kir301758/public_html/tks-ind.co.jp/php/improvement.php on line 365