Index: openacs-4/packages/categories/www/cadmin/synonym-delete.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/categories/www/cadmin/synonym-delete.tcl,v
diff -u -N -r1.6 -r1.7
--- openacs-4/packages/categories/www/cadmin/synonym-delete.tcl	29 Jun 2018 17:27:18 -0000	1.6
+++ openacs-4/packages/categories/www/cadmin/synonym-delete.tcl	29 Nov 2019 14:28:48 -0000	1.7
@@ -27,8 +27,8 @@
 set page_title "Delete synonyms of category \"$tree_name :: $category_name\""
 
 set context_bar [category::context_bar $tree_id $locale \
-                     [value_if_exists object_id] \
-                     [value_if_exists ctx_id]]
+                     [expr {[info exists object_id] ? $object_id : ""}] \
+                     [expr {[info exists ctx_id] ? $ctx_id : ""}]]
 lappend context_bar [list [export_vars -no_empty -base synonyms-view { category_id tree_id locale object_id ctx_id}] "Synonyms of $category_name"] "Delete synonyms"
 
 set delete_url [export_vars -no_empty -base synonym-delete-2 { synonym_id:multiple category_id tree_id locale object_id ctx_id}]