How to get rid of "Error 1329: No data - zero rows fetched, selected, or processed"

I have a stored procedure which does not need to return any values. It runs smoothly and without any problem. However, it outputs an error message after finishing its run:

Error: No data - zero rows fetched, selected, or processed

How can I get rid of this error message?

CREATE PROCEDURE `testing_proc`()  
    READS SQL DATA  
BEGIN  
    DECLARE done INT DEFAULT 0;
    DECLARE l_name VARCHAR(20);
    DECLARE my_cur CURSOR FOR
        SELECT name FROM customer_tbl;
    OPEN my_cur;
        my_cur_loop:
        LOOP FETCH my_cur INTO l_name;
            IF done = 1 THEN
                LEAVE my_cur_loop;
            END IF;
            INSERT INTO names_tbl VALUES(l_name);
        END LOOP my_cur_loop;
    CLOSE my_cur;
END