Hi, `output_dict` is made sure to be a dictionary just above the line below. https://github.com/pytorch/ignite/blob/21a2ccc25dd7ff0aec5f1538387597cb093fe36e/ignite/contrib/handlers/base_logger.py#L108 So this line could be replaced with: ```python metrics_state_attrs.update(output_dict) ```