// in code snippet.
function sptp_suppress_filters_mod( $suppress_filters){
	if (defined('DOING_AJAX') && DOING_AJAX) {
	 	$suppress_filters = true;
	 } else {
	 	$suppress_filters = false;
	}

	return $suppress_filters;
}
add_filter( 'sptp_suppress_filters', 'sptp_suppress_filters_mod');

function sptp_filter_groups_mod( $group, $shortcode_id ){
	if('' == $group ){
		$sptp_group = get_terms(array(
			'taxonomy' => 'sptp_group',
			'hide_empty' => false,
		));
		$group = array();
		foreach($sptp_group as $category) {
			$group[] = $category->slug;
		}
	}
	return $group;
}
add_filter( 'sptp_filter_groups', 'sptp_filter_groups_mod', 10, 2);

// New hook in ajax search funtion.
$group = apply_filters( 'sptp_filter_groups', $group, $generator_id );

// Helper.php in sptp_query funtion
if ( isset( $group ) && ! empty( $group ) ) {
			$args['tax_query'] = array(
				array(
					'taxonomy' => 'sptp_group',
					'field'    => 'slug',
					'terms'    => $group,
				),
			);
		}