Index: openacs-4/packages/tasks/tcl/tasks-callback-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/tasks/tcl/tasks-callback-procs.tcl,v
diff -u -r1.11 -r1.12
--- openacs-4/packages/tasks/tcl/tasks-callback-procs.tcl	25 Apr 2018 19:47:48 -0000	1.11
+++ openacs-4/packages/tasks/tcl/tasks-callback-procs.tcl	9 May 2018 15:33:33 -0000	1.12
@@ -23,7 +23,7 @@
 } {
     Add task history to this party. Return as list
 } {
-    set tasks {}
+    set tasks [list]
     db_foreach get_tasks {
         select t.task_id,
                t.completed_date as completion_date,