Libpq PQExecParams returns null

From: "Harry Hehl" <Harry(dot)Hehl(at)diskstream(dot)com>
To: <pgsql-interfaces(at)postgresql(dot)org>
Subject: Libpq PQExecParams returns null
Date: 2006-06-06 16:37:57
Message-ID: 6AD4F3A63B017C4FB074E2C895AD18542B6917@EXCHSRV.waterloonetworking.net
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Hello

I am using 8.1.3 on FC4

Occasionally a query will fail. PQExecParams returns null and
PQerrorMessage returns an empty string. Subsequent calls succeed.

I found this from a previous post where PQexecPrepared return null.

"AFAIR the only reasons for a null result (instead of a possibly-error
PGresult) would be out-of-memory or connection failure."

I my case subsequent calls succeed and the application is not out of
memory.

What are the possibilities where PQExecParams returns null and
PQerrorMessage returns an empty string?

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