Index: openacs-4/packages/xowf/tcl/test-item-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowf/tcl/test-item-procs.tcl,v
diff -u -N -r1.7.2.50 -r1.7.2.51
--- openacs-4/packages/xowf/tcl/test-item-procs.tcl	22 Apr 2020 19:56:26 -0000	1.7.2.50
+++ openacs-4/packages/xowf/tcl/test-item-procs.tcl	22 Apr 2020 20:17:59 -0000	1.7.2.51
@@ -2150,7 +2150,12 @@
       set minutes 0
       foreach title_info [dict get $form_info title_infos] {
         if {[dict exists $title_info minutes]} {
-          set minutes [expr {$minutes + [dict get $title_info minutes]}]
+          set title_minutes [dict get $title_info minutes]
+          if {$title_minutes eq ""} {
+             ns_log notice "missing minutes in '$title_info'"
+             set title_minutes 0
+          }
+          set minutes [expr {$minutes + $title_minutes}]
         }
       }
       return $minutes