diff --git a/Database/Persist/MongoDB.hs b/Database/Persist/MongoDB.hs
--- a/Database/Persist/MongoDB.hs
+++ b/Database/Persist/MongoDB.hs
@@ -418,11 +418,17 @@
     zipFilter [] _  = []
     zipFilter _  [] = []
     zipFilter (fd:efields) (pv:pvs) =
-        if pv == PersistNull then recur else
+        if isNull pv then recur else
           (fieldToLabel fd DB.:= embeddedVal (fieldEmbedded fd) pv):recur
       where
         recur = zipFilter efields pvs
-        -- make sure to removed nulls from an embedded value also
+
+        isNull PersistNull = True
+        isNull (PersistMap m) = null m
+        isNull (PersistList l) = null l
+        isNull _ = False
+
+        -- make sure to removed nulls from embedded entities also
         embeddedVal :: Maybe (EntityDef a) -> PersistValue -> DB.Value
         embeddedVal (Just emDef) (PersistMap m) = DB.Doc $
           zipFilter (entityFields emDef) $ map snd m
diff --git a/persistent-mongoDB.cabal b/persistent-mongoDB.cabal
--- a/persistent-mongoDB.cabal
+++ b/persistent-mongoDB.cabal
@@ -1,5 +1,5 @@
 name:            persistent-mongoDB
-version:         1.4.4
+version:         1.4.4.1
 license:         MIT
 license-file:    LICENSE
 author:          Greg Weber <greg@gregweber.info>