The following bug has been logged online:

Bug reference:      5310
Logged by:          Lothar Bongartz
Email address:      lotharbonga...@hotmail.com
PostgreSQL version: 8.4
Operating system:   Windows XP Professioanl
Description:        "NOT FOUND" throws "GetData to Procedure return failed."
in stored functions
Details: 

A "NOT FOUND" condition in a stored function throws a "GetData to Procedure
return failed." error, which cannot be trapped by the EXCEPTION handling.
Example:

SELECT msg_id INTO v_nm FROM newmail WHERE memb_id=v_id;

The only way to avoid the complete failing of the stored function is to do a
check before:

IF EXISTS (SELECT * FROM newmail WHERE memb_id=v_id) THEN
    SELECT msg_id INTO v_nm FROM newmail WHERE memb_id=v_id;
END IF;

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