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 -N -r1.55.2.2 -r1.55.2.3
--- openacs-4/packages/xowiki/tcl/folder-procs.tcl	26 Feb 2019 11:35:19 -0000	1.55.2.2
+++ openacs-4/packages/xowiki/tcl/folder-procs.tcl	28 Feb 2019 12:50:29 -0000	1.55.2.3
@@ -562,8 +562,9 @@
     # We have to use the global variable for the time being due to
     # scoping in "-columns"
     set ::__xowiki_with_publish_status [expr {$publish_status ne "ready"}]
-    set ::__xowiki_folder_link [$package_id make_link $current_folder bulk-delete {__csrf_token $::__csrf_token}]
-
+    # unexisting csrf token usually means we are outside a connection thread
+    set csrf [expr {[info exists ::__csrf_token] ? [list __csrf_token $::__csrf_token] : ""}]
+    set ::__xowiki_folder_link [$package_id make_link $current_folder bulk-delete $csrf]
     switch [$package_id get_parameter PreferredCSSToolkit bootstrap] {
       bootstrap {set tableWidgetClass ::xowiki::BootstrapTable}
       default   {set tableWidgetClass ::xowiki::YUIDataTable}