Oracle Forms

Hi,

Oracle DB 11g.

Forms 6i

procedure test is 
cursor c1 is select col1, col2 from my_table1 where col0 =  :my_block.col0;
cursor c2 is select col3 from my_table2 ;
cursor c3 is select col4, col5 from my_table2 where col0 =  :my_block.col0;


begin


go_block('my_block');
open c2;
LOOP
    FETCH c2
      INTO :my_block.col3;
    EXIT WHEN c2%NOTFOUND;
    next_record;
  END LOOP;
  CLOSE c2;


first_record;
  LOOP
    OPEN c1;
    FETCH c1
      INTO :my_block.col1, :my_block.col2;
    CLOSE c1;
    EXIT WHEN :system.last_record = 'TRUE';
    next_record;
  END LOOP;


first_record;
  LOOP
    OPEN c3;
    FETCH c3
      INTO :my_block.col4, :my_block.col5;
    CLOSE c3;
    EXIT WHEN :system.last_record = 'TRUE';
    next_record;
  END LOOP;


first_record;


EXCEPTION
  WHEN OTHERS THEN
    afficher_exception('test');
END;

This code works correctly almost the time but sometimes an error ora-01003 no statement parsed occurs and my procedure stops working!!!

I've locked in the internet how to resolve it but nothing was adequate with my case!

Any help?

Best regards.