trouble with rules

Hi!

can somebody see this too?

create table t1(i1 int4);
create table t2(i1 int4);
create table t3(i2 int4);

test=> create rule rm_t1 as on delete to t1
test-> do ( delete from t2 where old.i1 = i1;
test-> delete from t3 where old.i1 = i2;);
pqReadData() -- backend closed the channel unexpectedly.
This probably means the backend terminated abnormally before or
while processing the request.
We have lost the connection to the backend, so further processing is
impossible. Terminating.

OS = Linux 2.0.35, gcc 2.7.2.3, postgreSQL-6.4.2

Regards
Erich