ErrorException: Warning: Invalid argument supplied for foreach()
  File "/app/source/public/wp-content/themes/planet4-master-theme/classes/class-p4-search.php", line 198, in P4_Search::get_paged_posts
    foreach ( $filter_type as $name => $id ) {
  File "/app/source/public/wp-includes/class-wp-hook.php", line 288, in WP_Hook::apply_filters
    $value = call_user_func_array( $the_['function'], $args );
  File "/app/source/public/wp-includes/class-wp-hook.php", line 312, in WP_Hook::do_action
    $this->apply_filters( '', $args );
  File "/app/source/public/wp-includes/plugin.php", line 478, in do_action
    $wp_filter[ $tag ]->do_action( $arg );
  File "/admin-ajax.php", line 190
    do_action( "wp_ajax_nopriv_{$action}" );