Index: openacs-4/packages/workflow/tcl/workflow-procs.xql
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/workflow/tcl/workflow-procs.xql,v
diff -u -N -r1.8 -r1.9
--- openacs-4/packages/workflow/tcl/workflow-procs.xql	23 Nov 2017 12:38:07 -0000	1.8
+++ openacs-4/packages/workflow/tcl/workflow-procs.xql	23 Nov 2017 16:39:16 -0000	1.9
@@ -75,7 +75,7 @@
 
   <fullquery name="workflow::default_sort_order.max_sort_order">
     <querytext>
-        select max(sort_order)
+        select coalesce(max(sort_order), 0)
         from   $table_name
         where  workflow_id = :workflow_id
     </querytext>