Crash in pgCrypto?

Could someone using the pgcrypto extension please verify this?

SELECT encode(digest(null, 'md5'::text), 'hex');
or
SELECT digest(null, 'md5');

Takes a few seconds, and then crashes the server with a Signal 11. My
system is PostgreSQL 8.2.7. Seems to be an unchecked access to memory
location 0.

Best regards,
Mario Weilguni