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Fatal error: Uncaught mysqli_sql_exception: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1 in /home/teachmath.helioho.st/httpdocs/API/AdminV1/courseStudy.php:9 Stack trace: #0 /home/teachmath.helioho.st/httpdocs/API/AdminV1/courseStudy.php(9): mysqli->query() #1 {main} thrown in /home/teachmath.helioho.st/httpdocs/API/AdminV1/courseStudy.php on line 9