diff --git a/weed/filer/redis3/skiplist_element_store.go b/weed/filer/redis3/skiplist_element_store.go
index fa13d35e9..66a5408d6 100644
--- a/weed/filer/redis3/skiplist_element_store.go
+++ b/weed/filer/redis3/skiplist_element_store.go
@@ -48,5 +48,15 @@ func (m *SkipListElementStore) LoadElement(id int64) (*skiplist.SkipListElement,
 	}
 	t := &skiplist.SkipListElement{}
 	err = proto.Unmarshal([]byte(data), t)
+	if err == nil {
+		for i:=0;i<len(t.Next);i++{
+			if t.Next[i].IsNil() {
+				t.Next[i] = nil
+			}
+		}
+		if t.Prev.IsNil() {
+			t.Prev = nil
+		}
+	}
 	return t, err
 }