Problem with cursors

[gjain12]

When i am trying to loop through cursor using a not found continue handler I am facing a problem, for a select staement inside cursor loop the not found condition is getting true and hence the cursor loop is also getting completed

   DECLARE CONTINUE HANDLER FOR NOT FOUND 
   SET at_end=1;
   OPEN C1;     
   FETCH C1 INTO perm;
   WHILE at_end = 0 DO
    <some select statement   which returns null some time> 
    <when null is returned the continue handler set at_end=1>.. :(
  FETCH C1 INTO perm
END WHILE;
   CLOSE C1;