diff --git a/VERSION b/VERSION
index 2debad93..0f52e09a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.4.6-stable+timestamp.2013.04.28.17.31.30
+Version 2.4.6-stable+timestamp.2013.04.28.23.04.43
diff --git a/gluon/html.py b/gluon/html.py
index 97a322b7..6a950537 100644
--- a/gluon/html.py
+++ b/gluon/html.py
@@ -1992,7 +1992,7 @@ class FORM(DIV):
         status = True
         changed = False
         request_vars = self.request_vars
-        if session:
+        if session is not None:
             formkey = session.get('_formkey[%s]' % formname, None)
             # check if user tampering with form and void CSRF
             if formkey != request_vars._formkey: