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 -r1.315 -r1.316
--- openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	11 Apr 2013 12:56:24 -0000	1.315
+++ openacs-4/packages/xowiki/tcl/xowiki-www-procs.tcl	6 Jul 2013 14:18:56 -0000	1.316
@@ -837,6 +837,10 @@
     dom parse -simple -html $form doc
     $doc documentElement root
 
+    if {$root eq ""} {
+      error "form '$form' is not valid"
+    }
+
     ::require_html_procs
     $root firstChild fcn
     #my msg "orig fcn $fcn, root $root [$root nodeType] [$root nodeName]"