Index: openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl,v
diff -u -N -r1.189.2.6 -r1.189.2.7
--- openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl	13 Mar 2019 11:51:59 -0000	1.189.2.6
+++ openacs-4/packages/acs-tcl/tcl/utilities-procs.tcl	30 Mar 2019 19:38:05 -0000	1.189.2.7
@@ -1574,7 +1574,7 @@
             if { $excluded_vars_url ne "" } {
                 append excluded_vars_url "&"
             }
-            append excluded_vars_url [export_vars -url [list [list "$item" "$value"]]]
+            append excluded_vars_url [export_vars -url {{"$item" "$value"}}]
         }
     }