diff --git a/VERSION b/VERSION
index f2cb0069..d61072d9 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.7.4-stable+timestamp.2013.11.14.13.28.53
+Version 2.7.4-stable+timestamp.2013.11.16.03.15.58
diff --git a/gluon/dal.py b/gluon/dal.py
index 6005634b..48970c36 100644
--- a/gluon/dal.py
+++ b/gluon/dal.py
@@ -5592,6 +5592,8 @@ class MongoDBAdapter(NoSQLAdapter):
             # string or integer
             return datetime.datetime.combine(d, value)
         elif fieldtype == "blob":
+            if value== None:
+                return value
             from bson import Binary
             if not isinstance(value, Binary):
                 if not isinstance(value, basestring):