Not working after data update. foreach() error.

After updating the data, as requested, I’m getting this error:
“Warning: Invalid argument supplied for foreach() in /nfs/c10/h02/mnt/177080/domains/priestofgamers.church/html/wp-content/plugins/post-grid/grid-items/variables.php on line 87”

The Argument in question is:

//var_dump($query_orderby);
$str_orderby = ”;
foreach($query_orderby as $orderby){

$str_orderby.= $orderby.’ ‘;

}
$query_orderby = $str_orderby;
//var_dump($query_orderby);

if(!empty($post_grid_meta_options[‘query_orderby_meta_key’])){
$query_orderby_meta_key = $post_grid_meta_options[‘query_orderby_meta_key’];
}
else{
$query_orderby_meta_key = ”;
}

https://wordpress.org/plugins/post-grid/