ZeroDivisionError: division by zero

[Sususuqii]

Traceback (most recent call last):
File "train_script.py", line 87, in
continue_training_at_step=0)
File "/disk2/sushunqi/pytorch-wavenet-master/wavenet_training.py", line 90, in train
self.logger.log(step, loss)
File "/disk2/sushunqi/pytorch-wavenet-master/model_logging.py", line 35, in log
self.validate(current_step)
File "/disk2/sushunqi/pytorch-wavenet-master/model_logging.py", line 86, in validate
avg_loss, avg_accuracy = self.trainer.validate()
File "/disk2/sushunqi/pytorch-wavenet-master/wavenet_training.py", line 110, in validate
avg_loss = total_loss / len(self.dataloader)
ZeroDivisionError: division by zero

Thank you very much!!