Index: openacs-4/packages/xowiki/tcl/folder-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/folder-procs.tcl,v
diff -u -r1.55.2.13 -r1.55.2.14
--- openacs-4/packages/xowiki/tcl/folder-procs.tcl	23 Jul 2019 14:14:59 -0000	1.55.2.13
+++ openacs-4/packages/xowiki/tcl/folder-procs.tcl	24 Jul 2019 12:50:51 -0000	1.55.2.14
@@ -501,8 +501,7 @@
 
   child-resources instproc types_to_show {} {
     :get_parameters
-    foreach type [split $show_types ,] {set ($type) 1}
-    return [lsort [array names ""]]
+    return [lsort -unique [split $show_types ,]]
   }
 
   child-resources instproc render {} {