Dynatron Q9 - processor cooler

Fatal error: Uncaught mysqli_sql_exception: syntax error, unexpected '+' in /home/techbuys/public_html/require/classes/userService.php:75 Stack trace: #0 /home/techbuys/public_html/require/classes/userService.php(75): mysqli->query('SELECT * FROM p...') #1 /home/techbuys/public_html/product-detail.php(400): userService->getRelatedProducts('WHERE qty>0 AND...') #2 {main} thrown in /home/techbuys/public_html/require/classes/userService.php on line 75