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Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /home/swh74058/public_html/demo.pizzaria.sofie-van-der-meer.be/toevoegen.php:24 Stack trace: #0 /home/swh74058/public_html/demo.pizzaria.sofie-van-der-meer.be/toevoegen.php(24): in_array() #1 {main} thrown in /home/swh74058/public_html/demo.pizzaria.sofie-van-der-meer.be/toevoegen.php on line 24