function dozent_is_completed_course( $course_ID = 0, $user_ID = 0 ) {
		global $wpdb;

		$course_ID = dozent_get_post_id( $course_ID );
		$user_ID   = dozent_get_user_id( $user_ID );

		$is_completed = $wpdb->get_row(
			$wpdb->prepare(
				"SELECT * FROM $wpdb->dozent_completes
        where completed_course_id = %d
        AND user_id = %d ;", [ $course_ID, $user_ID ] )
		);

		return $is_completed;
	}