Warning: mysqli::query(): Couldn't fetch mysqli in C:\wwwroot\szhstl.com\products.php on line 30

Fatal error: Uncaught Error: Call to a member function fetch_all() on bool in C:\wwwroot\szhstl.com\products.php:30 Stack trace: #0 {main} thrown in C:\wwwroot\szhstl.com\products.php on line 30