Index: openacs-4/packages/forums/tcl/forums-sc-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/forums/tcl/forums-sc-procs.tcl,v
diff -u -r1.15 -r1.16
--- openacs-4/packages/forums/tcl/forums-sc-procs.tcl	30 Apr 2018 09:07:45 -0000	1.15
+++ openacs-4/packages/forums/tcl/forums-sc-procs.tcl	9 May 2018 15:33:31 -0000	1.16
@@ -45,7 +45,7 @@
     set tree_sortkey $message(tree_sortkey)
     set forum_id $message(forum_id)
     set combined_content ""
-    set subjects {}
+    set subjects [list]
     lappend subjects $message(subject)
 
     db_foreach messages "" {