Index: openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl,v
diff -u -r1.368.2.71 -r1.368.2.72
--- openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	25 Sep 2020 07:01:46 -0000	1.368.2.71
+++ openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	25 Sep 2020 07:04:44 -0000	1.368.2.72
@@ -71,7 +71,7 @@
         set item_id [dict get $ref item_id]
         ns_log notice "www-clipboard-add item_ref <$ref> -> item_id"
       }
-      if {$item_id == 0} {
+      if {![info exists item_id] || $item_id == 0} {
         #
         # Try to resolve either via a passed in parent_id or via direct
         # child or via sibling.