diff --git a/db/db_impl.cc b/db/db_impl.cc
index 49b9595..d405e58 100644
--- a/db/db_impl.cc
+++ b/db/db_impl.cc
@@ -1275,6 +1275,8 @@ WriteBatch* DBImpl::BuildBatchGroup(Writer** last_writer) {
         WriteBatchInternal::Append(result, first->batch);
       }
       WriteBatchInternal::Append(result, w->batch);
+    } else {
+      break;
     }
     *last_writer = w;
   }