🚀 go-pugleaf

I get the following Error, The Stored Procedure is not preexistant :

ISC ERROR CODE:335544351

ISC ERROR MESSAGE:
unsuccessful metadata update
STORE RDB$PROCEDURE_PARAMETERS failed
lock conflict on no wait transaction
attempt to store duplicate value (visible to active transactions) in unique 
index "RDB$INDEX_18"

The procedure is as follows

CREATE PROCEDURE PROC_EXT_MYTABLE
( ROWS_PROCESSED_SO_FAR INTEGER, ROWS_PERCYCLE INTEGER )
RETURNS
( BATCH_ROWS_PROCESSED INTEGER )
AS
DECLARE VARIABLE THESTOREID VARCHAR(10);
DECLARE VARIABLE THESALESDATE TIMESTAMP;
DECLARE VARIABLE THEPLU VARCHAR(14);
DECLARE VARIABLE THEQUANTITYSOLD FLOAT;
DECLARE VARIABLE THESALESEXGST FLOAT;
DECLARE VARIABLE THECOSTEXGST FLOAT;
DECLARE VARIABLE THESALESINCGST FLOAT;
DECLARE VARIABLE THECOSTINCGST FLOAT;
DECLARE VARIABLE THECOUNT INTEGER;
BEGIN
  DO SUMETHING;
  BATCH_ROWS_PROCESSED = THECOUNT;
  SUSPEND;
END;

How can this possibly happen?

Kind Regards,

Robert.