return;
			}

			// Get original meta query.
			$meta_query = $query->get( 'meta_query' );
			if ( ! is_array( $meta_query ) ) {
				$meta_query = array();
			}

			$meta_query['relation'] = 'AND';
			$meta_query             = self::maybe_add_meta_query(
				$meta_query,
				apply_filters( 'invp_prefix_meta_key', 'price' ),
				(int) $_GET['max_price'],
				'<=',
				'numeric'
			);
			$query->set( 'meta_query', $meta_query );
		}

		/**
		 * Filter callback. Modifies a query's ORDER BY clause to appropriately
		 * sort some meta values as numbers instead of strings while adding fields
		 * to the ORDER BY clause to account for all of the JOINs to the postmeta.
		 *
		 * @param  array $pieces All of a queries syntax organized into an array.
		 * @return array The changed array of database query fragments
		 */
		public function modify_query_orderby( $pieces ) {
			/**
			 * Count the number of meta fields we have added to the query by parsing
			 * the join piece of the query
			 */
			global $wpdb;
			$meta_field_count = count( explode( "INNER JOIN $wpdb->postmeta AS", $pieces['join'] ) ) - 1;

			// Parse out the ASC or DESC sort direction from the end of the ORDER BY clause.
			$direction             = $this->get_last_word( $pieces['orderby'] );
			$acceptable_directions = array( 'ASC', 'DESC' );
			$direction             = ( in_array( $direction, $acceptable_directions, true ) ? ' ' . $direction : '' );

			/**
			 * Build a string to replace the existing ORDER BY field name
			 * Essentially, we are going to turn '{$wpdb->postmeta}.meta_value' into
			 * 'mt1.meta_value ASC, mt2.meta_value ASC, mt3.meta_value ASC'
			 * where the number of meta values is what we calculated in $meta_field_count
			 */