child theme functions.php breaks website

Hi Yigit,

We copied the functions.php from the child theme you offer as a download. This ’empty’ file does not break the website. But if we place code in it, it does.

We copied this code in it and the website breaks:

<?php

/*
* Add your own functions here. You can also copy some of the theme functions into this file. 
* WordPress will use those functions instead of the original functions then.
*/

//set builder mode to debug
add_action('avia_builder_mode', "builder_set_debug");
function builder_set_debug()
{
	return "debug";
}