Index: openacs-4/packages/forums/sql/postgresql/forums-tree-create.sql
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/forums/sql/postgresql/forums-tree-create.sql,v
diff -u -r1.4 -r1.5
--- openacs-4/packages/forums/sql/postgresql/forums-tree-create.sql	24 Jun 2002 22:37:52 -0000	1.4
+++ openacs-4/packages/forums/sql/postgresql/forums-tree-create.sql	25 Jun 2002 18:09:33 -0000	1.5
@@ -55,6 +55,9 @@
     end if;
 
     -- generate the current sortkey
+    if v_parent_sortkey is null then
+        v_parent_sortkey := '''';
+    end if;
     new.tree_sortkey := v_parent_sortkey || v_max_child_sortkey;
 
     return new;