Index: openacs-4/packages/xowiki/tcl/xowiki-form-procs.tcl
===================================================================
RCS file: /usr/local/cvsroot/openacs-4/packages/xowiki/tcl/xowiki-form-procs.tcl,v
diff -u -r1.147.2.28 -r1.147.2.29
--- openacs-4/packages/xowiki/tcl/xowiki-form-procs.tcl	15 Dec 2022 19:30:02 -0000	1.147.2.28
+++ openacs-4/packages/xowiki/tcl/xowiki-form-procs.tcl	24 Dec 2022 16:21:28 -0000	1.147.2.29
@@ -274,6 +274,13 @@
         return 0
       }
     } else {
+      if {![$data istype ::xowiki::File] && [regexp {^[a-zA-Z][a-zA-Z]:$} $name]} {
+        #
+        # The name looks like a language prefix followed by an empty
+        # name. Empty names are not allowed.
+        #
+        return 0
+      }
       $data name $name
       #
       # Try first to get the language from the form parameter