Within the Tools>Site Health section you will notice such an error caused by the Unyson plugin:

“A PHP session was created by a session_start() function call. This interferes with REST API and loopback requests. The session should be closed by session_write_close() before making any HTTP requests.”

In order to fix it, you will need to add the following code within the functions.php file of your child theme:

if (!function_exists('_disable_fw_use_sessions')) { add_filter('fw_use_sessions','_disable_fw_use_sessions');

function _disable_fw_use_sessions(){ 

return false;


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