tuple concurrently updated

["Andrus" <kobruleht2@xxxxxx>]

My application receives the folllowing error sometimes.

Any idea how to fix ?

Andrus.

7/XX000:Error while executing the query;ERROR:  tuple concurrently updated

CONTEXT:  SQL statement "DROP TABLE templsabi"PL/pgSQL function "drop_table" 
line 2 at execute statement

SELECT drop_table('templsabi');CREATE TABLE templsabi AS
   select
     toode,
     osak as sihtyksus,
     partii,
     laosumma,

     1 as lj, 0 as st, 0 as vm,
     0 as kaubasumma,
     kogus,
     0 as kogpak,
     CAST('' AS CHAR(10)) as yksus,
     CAST('' AS CHAR(1)) as doktyyp
   from HETKESEI
   where true
AND osak LIKE 'TARTU%' ESCAPE '!'

AND toode='DIS123103'
;SELECT * FROM templsabi

drop_table is defined as

CREATE OR REPLACE FUNCTION drop_table(TEXT)
 RETURNS VOID STRICT LANGUAGE plpgsql AS $$
BEGIN
   EXECUTE 'DROP TABLE ' || $1;
   EXCEPTION WHEN UNDEFINED_TABLE THEN
RETURN;
END;
$$;