diff --git a/pytorch_lightning/trainer/train_loop_mixin.py b/pytorch_lightning/trainer/train_loop_mixin.py
index 68c34cf4..7e9fde01 100644
--- a/pytorch_lightning/trainer/train_loop_mixin.py
+++ b/pytorch_lightning/trainer/train_loop_mixin.py
@@ -155,7 +155,7 @@ class TrainerTrainLoopMixin(object):
         all_log_metrics = []
 
         if batch is None:
-            return 0, grad_norm_dic
+            return 0, grad_norm_dic, {}
 
         # hook
         if self.is_function_implemented('on_batch_start'):
@@ -163,7 +163,7 @@ class TrainerTrainLoopMixin(object):
             response = model_ref.on_batch_start(batch)
 
             if response == -1:
-                return -1, grad_norm_dic
+                return -1, grad_norm_dic, {}
 
         splits = [batch]
         if self.truncated_bptt_steps is not None: