Proves proves 123
Additional information
Sample checkbox custom: 
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 3 in /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/classes/database/DBCommandClass.php:954 Stack trace: #0 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/classes/database/DBCommandClass.php(954): mysqli->query('SELECT *\nFROM (...') #1 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/classes/database/DBCommandClass.php(859): DBCommandClass->_execute('SELECT *\nFROM (...') #2 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/classes/database/DBCommandClass.php(1234): DBCommandClass->query('SELECT *\nFROM (...') #3 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-content/plugins/cars_attributes/ModelCars.php(177): DBCommandClass->get() #4 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-content/plugins/cars_attributes/index.php(131): ModelCars->getCarMakeById(NULL) #5 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/classes/Plugins.php(40): cars_item_detail(Array) #6 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/helpers/hPlugins.php(31): Plugins::runHook('item_detail', Array) #7 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-content/themes/zara/item.php(255): osc_run_hook('item_detail', Array) #8 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/helpers/hDefines.php(288): require('/data/6/8/68312...') #9 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/controller/item.php(798): osc_current_web_theme_path('item.php') #10 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/controller/item.php(788): CWebItem->doView('item.php') #11 /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/index.php(97): CWebItem->doModel() #12 {main} thrown in /data/6/8/68312d4c-1caf-4a7f-b3e6-16c8eb184f3f/mb-themes.com/sub/zara/oc-includes/osclass/classes/database/DBCommandClass.php on line 954