function bbp_get_topic_author_url( $topic_id = 0 ) {
		$topic_id = bbp_get_topic_id( $topic_id );

		// Check for anonymous user or non-existant user
		if ( ! bbp_is_topic_anonymous( $topic_id ) && bbp_user_has_profile( bbp_get_topic_author_id( $topic_id ) ) ) {
			$author_url = bbp_get_user_profile_url( bbp_get_topic_author_id( $topic_id ) );
		} else {
			$author_url = get_post_meta( $topic_id, '_bbp_anonymous_website', true );

			// Set empty author_url as empty string
			if ( empty( $author_url ) ) {
				$author_url = '';
			}
		}

		// Filter & return
		return apply_filters( 'bbp_get_topic_author_url', $author_url, $topic_id );
	}