The following bug has been logged online:

Bug reference:      6295
Logged by:          Jonas Forsman
Email address:      jfo...@hotmail.com
PostgreSQL version: 8.4.9
Operating system:   Ubuntu 10.04 LTS
Description:        Update fails on empty concatenated strings
Details: 

Field description (note the field name is "comment") :
comment character varying(2048)

sql:
UPDATE user SET comment= E'[2011-11-16] Note to myself no: 171\\n' ||
comment WHERE userid=1

This query fails if comment is an empty string or null.

This works:

UPDATE user SET comment= E'[2011-11-16] Note to myself no: 171\\n' ||
comment || '' WHERE userid=1

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