Index: openacs-4/packages/xowiki/tcl/import-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/import-procs.tcl,v
diff -u -N -r1.41 -r1.42
--- openacs-4/packages/xowiki/tcl/import-procs.tcl	17 Dec 2018 17:58:58 -0000	1.41
+++ openacs-4/packages/xowiki/tcl/import-procs.tcl	4 Jan 2019 15:54:50 -0000	1.42
@@ -260,7 +260,7 @@
     #
     # final cleanup
     #
-    foreach o $objects {$o destroy}
+    foreach o $objects {if {[::xotcl::Object isobject $o]} {$o destroy}}
 
     ${:package_id} flush_page_fragment_cache
   }