Invalid argument supplied for foreach() since updating my Customizr theme - php

Question

I just updated my Customizr child theme and I'm getting the following error on my dashboard:
Warning: Invalid argument supplied for foreach() in /home/beaufort/public_html/wp-content/themes/customizr/inc/class-fire-utils.php on line 653
This is what is on line 653:
foreach ( $_font_groups as $_group_slug => $_font_list ) {
and this is what follows:
if ( 'list' == $_what ) {
$_to_return[$_group_slug] = array();
$_to_return[$_group_slug]['list'] = array();
$_to_return[$_group_slug]['name'] = $_font_list['name'];
}
I am clueless when it comes to php so your help would be much appreicated!
Many thanks
/**
* #return an array of font name / code OR a string of the font css code
* #parameter string name or google compliant suffix for href link
*
* #package Customizr
* #since Customizr 3.2.9
*/
function tc_get_font( $_what = 'list' , $_requested = null ) {
$_to_return = ( 'list' == $_what ) ? array() : false;
$_font_groups = apply_filters(
'tc_font_pairs',
TC_init::$instance -> font_pairs
);
foreach ( $_font_groups as $_group_slug => $_font_list ) {
if ( 'list' == $_what ) {
$_to_return[$_group_slug] = array();
$_to_return[$_group_slug]['list'] = array();
$_to_return[$_group_slug]['name'] = $_font_list['name'];
}
foreach ( $_font_list['list'] as $slug => $data ) {
switch ($_requested) {
case 'name':
if ( 'list' == $_what )
$_to_return[$_group_slug]['list'][$slug] = $data[0];
break;
case 'code':
if ( 'list' == $_what )
$_to_return[$_group_slug]['list'][$slug] = $data[1];
break;
default:
if ( 'list' == $_what )
$_to_return[$_group_slug]['list'][$slug] = $data;
else if ( $slug == $_requested ) {
return $data[1];
}
break;
}
}
}
return $_to_return;
}

Answer 1

Before line 653 add if (is_array($_font_groups)) {
Then, add a closing bracket } above return $_to_return;