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Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/basfanar/public_html/code/initializeCategories.php:5 Stack trace: #0 /home/basfanar/public_html/code/initializeCategories.php(5): mysqli_query(NULL, 'select id from ...') #1 /home/basfanar/public_html/index.php(34): include('/home/basfanar/...') #2 {main} thrown in /home/basfanar/public_html/code/initializeCategories.php on line 5