Advanced poll, postgresql and errors

I'm trying to configure poll with postgresql and generally everyything is ok, except small bugs - in file class_pgsql.php line
$query_strg = eregi_replace("limit ([0-9]+),([ 0-9]+)", "limit \\2, \\1", $query_strg);

should be replaced with:
$query_strg = eregi_replace("limit ([0-9]+),([ 0-9]+)", "limit \\2 offset \\1", $query_strg);

because of syntax of postgresql query.
But I have a second bug - when I'm clicking on poll (for example Demo1->Advanced poll) without previously selecting any item I've got an error:
Error : Query Error
Message : ERROR: invalid input syntax for integer: ""

Is here anybody who knows the solution?

Integers in SQL queries should be on their own not in double quotes.

Auron