Crash when trying to view SQL for new unique constraint

Hi developers!

Testing the pgAdmin III 1.8.0  Beta 4 (Sep 4 2007, rev: 6608:6609).
Client Win XP, host: Debian Sarge / PG 8.1.8; host: Debian Etch / PG 8.1.9

pgadmin crashes when I try to view the SQL for a UNIQUE constraint to be
created via dialog.

Steps to reproduce:
In the object tree, right click on the Constraints collection of a table
 -> New Object -> New Unique Constraint -> dialog.
Enter a name, add any filed(s).
pgAdmin goes down, when you try to view the SQL for this.

Additional Info:
- Does not crash with other constraints.
- Does not crash as long as no fields have been selected.
- Crashes with the hosts Debian Sarge / pg 8.1.8 or Debian Etch / pg 8.1.9
- Does not crash with host: Debian Etch / pg 8.2.4.
- The "Tablespace" combobox has an "empty" entry as default for pg
8.1.*, but nothing of the sort for pg 8.2.4.
  But it still crashes for pg 8.1.* if I choose "pg_default" instead


Regards
Erwin