diff --git a/hlrdb-core.cabal b/hlrdb-core.cabal
--- a/hlrdb-core.cabal
+++ b/hlrdb-core.cabal
@@ -1,5 +1,5 @@
 name:                hlrdb-core
-version:             0.1.2.1
+version:             0.1.2.2
 synopsis:            High-level Redis Database Core API
 description:         A library for type-driven interaction with Redis
 license:             MIT
diff --git a/src/HLRDB/Structures/HSet.hs b/src/HLRDB/Structures/HSet.hs
--- a/src/HLRDB/Structures/HSet.hs
+++ b/src/HLRDB/Structures/HSet.hs
@@ -41,9 +41,12 @@
     reifyTraversal tr bs = evalState (traverse g tr) bs
       where
         g a = do
-          (b:bs') <- Control.Monad.State.get
-          put bs'
-          return (a,b)
+          xs <- Control.Monad.State.get
+          case xs of
+            [] -> error "Impossible in hmget: unexpected data size in HLRDB.Structures.HSet.hmget"
+            (b:bs') -> do
+              put bs'
+              return (a,b)
 
 -- | Set via key and subkey
 hset :: MonadRedis m => RedisHSet a s b -> a -> s -> b -> m (ActionPerformed Creation)