Fatal error: Uncaught TypeError: mysqli_real_escape_string(): Argument #1 ($mysql) must be of type mysqli, null given in /home/sites/applis/surveys/csf_survey.php:187 Stack trace: #0 /home/sites/applis/surveys/csf_survey.php(187): mysqli_real_escape_string() #1 {main} thrown in /home/sites/applis/surveys/csf_survey.php on line 187