Opencart 1.5.6.4 Fatal error: Uncaught exception 'ErrorException'

Hello I wonder if someone could help me with an issue I'm having with this particular module I installed in OC 1.5.6.4. When I am trying to insert a product in admin, following error is showing:

Fatal error: Uncaught exception 'ErrorException' with message 'Error: 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<br />Error No: 1064<br />SELECT stock FROM oc_gorilla_stock WHERE product_id=' in /home/beadsjar/public_html/system/database/mysqli.php:41 Stack trace: #0 /home/beadsjar/public_html/vqmod/vqcache/vq2-system_library_db.php(29): DBMySQLi->query('SELECT stock FR...') #1 /home/beadsjar/public_html/admin/model/module/gorilla.php(151): DB->query('SELECT stock FR...') #2 /home/beadsjar/public_html/vqmod/vqcache/vq2-admin_controller_catalog_product.php(1055): ModelModuleGorilla->getGorillaStock(NULL) #3 /home/beadsjar/public_html/vqmod/vqcache/vq2-admin_controller_catalog_product.php(99): ControllerCatalogProduct->getForm() #4 [internal function]: ControllerCatalogProduct->insert() #5 /home/beadsjar/public_html/vqmod/vqcache/vq2-system_engine_front.php(66): call_user_func_array(Array, Array) #6 /home/beadsjar/public_ in /home/beadsjar/public_html/system/database/mysqli.php on line 41

I will be really grateful if someone could point me in the right direction.