Index: openacs-4/packages/categories/www/cadmin/permission-manage.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/categories/www/cadmin/permission-manage.tcl,v
diff -u -N -r1.9 -r1.10
--- openacs-4/packages/categories/www/cadmin/permission-manage.tcl	29 Jun 2018 17:27:18 -0000	1.9
+++ openacs-4/packages/categories/www/cadmin/permission-manage.tcl	29 Nov 2019 14:28:48 -0000	1.10
@@ -22,7 +22,7 @@
 set tree_name $tree(tree_name)
 set page_title [_ categories.Permissions_manage_title]
 
-set context_bar [category::context_bar $tree_id $locale [value_if_exists object_id]]
+set context_bar [category::context_bar $tree_id $locale [expr {[info exists object_id] ? $object_id : ""}]]
 lappend context_bar [_ categories.Permissions_manage]
 
 set url_vars [export_vars {tree_id object_id locale}]