Ajax post failing with TypeError

Hi, PaulC

Error in trace: Argument #3 ($filter) must be of type ?int, true given

Description of parameter #2 in the getPost function from User Guide
$filter (int) – The type of filter to apply. A list of filters can be found here.

PHP Code:

case 'get_ikulpic':
            {
                //Post reference
                $reference = $this->request->getPost('reference', true); 


in other words, the second parameter must be a INT and not a BOOL value