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 '-20, 20' at line 5 in /var/www/html/patient_area.php:49 Stack trace: #0 /var/www/html/patient_area.php(49): mysqli->query() #1 /var/www/html/index.php(267): include('...') #2 {main} thrown in /var/www/html/patient_area.php on line 49