The following bug has been logged online:

Bug reference: 1683
Logged by: Ilya Konyuhov
Email address: ilyakon (AT) mail (DOT) ru
PostgreSQL version: 8.0.2
Operating system: Red Hat 7.0
Description: Error in PQresultErrorField function
Details:

I am use libpq client on Windows 2000 SP4.

Function PQresultErrorMessage return not NULL value whith RGResult,
nevertheless PQresultErrorField function return NULL value whith same
RGResult and any fieldcodes.

---------------------------(end of broadcast)---------------------------
TIP 7: don't forget to increase your free space map settings