Using nulls with earthdistance operator crashes backend

Hello!

Here's now to reproduce my bug:
* Start with Postgres 7.1.2
(specifically: PostgreSQL 7.1 on i386--freebsd4.3, compiled by GCC 2.95.3
)
* Install earthdistance operator from the contrib directory.
* try this:
cascade=> select null <@> '1,1'::point;

## The result I get:
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally
before or while processing the request.
The connection to the server was lost. Attempting reset: Failed.

###############

I expected simply for "null" to be returned as the result. I can work
around
this by including an extra step to make sure that my data is not null
before
it's passed off a SQL statement like this.

Thanks!

-mark

http://mark.stosberg.com/