diff --git a/pytorch_lightning/models/trainer.py b/pytorch_lightning/models/trainer.py
index 3ee2b222..a667c25c 100644
--- a/pytorch_lightning/models/trainer.py
+++ b/pytorch_lightning/models/trainer.py
@@ -885,6 +885,6 @@ class Trainer(TrainerIO):
             self.prog_bar.set_postfix(**tqdm_metrics)
 
         # model checkpointing
-        if self.proc_rank == 0 and self.checkpoint_callback:
+        if self.proc_rank == 0 and self.checkpoint_callback is not None:
             print('save callback...')
             self.checkpoint_callback.on_epoch_end(epoch=self.current_epoch, logs=self.__tng_tqdm_dic)