diff --git a/src/llmtuner/hparams/parser.py b/src/llmtuner/hparams/parser.py
index 4fbc3db9..9264d1ee 100644
--- a/src/llmtuner/hparams/parser.py
+++ b/src/llmtuner/hparams/parser.py
@@ -120,7 +120,7 @@ def get_train_args(args: Optional[Dict[str, Any]] = None) -> _TRAIN_CLS:
 
     if (
         finetuning_args.stage == "ppo"
-        and training_args.report_to is not None
+        and training_args.report_to
         and training_args.report_to[0] not in ["wandb", "tensorboard"]
     ):
         raise ValueError("PPO only accepts wandb or tensorboard logger.")
diff --git a/src/llmtuner/train/ppo/trainer.py b/src/llmtuner/train/ppo/trainer.py
index 6be45958..020d54cf 100644
--- a/src/llmtuner/train/ppo/trainer.py
+++ b/src/llmtuner/train/ppo/trainer.py
@@ -66,7 +66,7 @@ class CustomPPOTrainer(PPOTrainer, Trainer):
             use_score_norm=finetuning_args.ppo_score_norm,
             whiten_rewards=finetuning_args.ppo_whiten_rewards,
             accelerator_kwargs={"step_scheduler_with_optimizer": False},
-            log_with=training_args.report_to[0] if training_args.report_to is not None else None,
+            log_with=training_args.report_to[0] if training_args.report_to else None,
             project_kwargs={"logging_dir": training_args.logging_dir},
         )