Index: openacs-4/packages/xowiki/tcl/xowiki-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-procs.tcl,v
diff -u -N -r1.542.2.21 -r1.542.2.22
--- openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	12 May 2019 19:55:44 -0000	1.542.2.21
+++ openacs-4/packages/xowiki/tcl/xowiki-procs.tcl	21 May 2019 08:07:39 -0000	1.542.2.22
@@ -991,7 +991,7 @@
     # Unset the context_id, which would otherwise come from the
     # original object and persisted. By default, will be set to the
     # new object's parent_id
-    unset :context_id
+    unset -nocomplain -- :context_id
     set :parent_id $parent_id
     set :package_id $package_id
     :reverse_map_party_attribute -attribute creation_user  \