Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /home/datadir/applications/econome-dev/API/V2_project/v2_damagepotential-beneficiary/PUT-beneficiaries.php:18 Stack trace: #0 {main} thrown in /home/datadir/applications/econome-dev/API/V2_project/v2_damagepotential-beneficiary/PUT-beneficiaries.php on line 18