tsearch consistency trigger on inheritated table

Hi,

The trigger from README:

create trigger txtidxupdate before update or insert on titles
 for each row execute procedure tsearch(titleidx, title);

When using this trigger on an inheritated table (with "title" being an
inheritated column), an insert or update on the table fails stating:

NOTICE:  TSearch: can not find field 'title'
ERROR:  ExecAppend: Fail to add null value in not null attribute created

Is this possible or did I mess everything completely up?

Btw, using txt2txtidx on all rows and selecting with ## and @@ works fine,
it is just the trigger.

Regards,
Bjoern