Index: openacs-4/packages/categories/www/cadmin/tree-delete.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/categories/www/cadmin/tree-delete.tcl,v
diff -u -N -r1.14 -r1.14.2.1
--- openacs-4/packages/categories/www/cadmin/tree-delete.tcl	29 Jun 2018 17:27:18 -0000	1.14
+++ openacs-4/packages/categories/www/cadmin/tree-delete.tcl	29 Nov 2019 14:32:04 -0000	1.14.2.1
@@ -30,8 +30,8 @@
 
 set page_title [_ categories.Delete_category_tree_title]
 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 [_ categories.Delete]
 
 set instance_list [category_tree::usage $tree_id]