Index: openacs-4/packages/acs-core-docs/www/tutorial-categories.adp
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/acs-core-docs/www/tutorial-categories.adp,v
diff -u -N -r1.4.2.1 -r1.4.2.2
--- openacs-4/packages/acs-core-docs/www/tutorial-categories.adp	2 Mar 2019 19:30:06 -0000	1.4.2.1
+++ openacs-4/packages/acs-core-docs/www/tutorial-categories.adp	29 Nov 2019 14:28:48 -0000	1.4.2.2
@@ -63,7 +63,7 @@
                         # extend the form to support categories
                         set package_id [ad_conn package_id]
                             
-                        category::ad_form::add_widgets -form_name note -container_object_id $package_id -categorized_object_id [value_if_exists item_id]
+                        category::ad_form::add_widgets -form_name note -container_object_id $package_id -categorized_object_id [expr {[info exists item_id] ? $item_id : ""}]
 
                         ad_form -extend -name note -on_submit {
                                 set category_ids [category::ad_form::get_categories -container_object_id $package_id]