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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/lmpjbhsv/public_html/triplova-project/api/user/user_category.php:9 Stack trace: #0 /home/lmpjbhsv/public_html/triplova-project/api/user/user_category.php(9): mysqli_query(NULL, 'SELECT * FROM c...') #1 {main} thrown in /home/lmpjbhsv/public_html/triplova-project/api/user/user_category.php on line 9