Display a Warning after upgrade

In case it helps, I experienced this error using tagDiv’s Newspaper theme (7.2) on PHP 5.3.29 and WordPress version 4.5.3.

Further, the theme authors are also looking into this issue. They’ve recommended a temporary hack (around line 215) of the n9m-font-awesome-4.php file. That code is on pastebin.

Here’s the code snippet:

function walker_nav_menu_start_el( $item_output, $item, $depth, $args ){
        if (is_array($item->classes)) {
            $classes = preg_grep( '/^(fa)(-\S+)?$/i', $item->classes );
            if( !empty( $classes ) ){
                $item_output = $this->replace_item( $item_output, $classes );
            }
        }

        return $item_output;
	 }