diff --git a/lerobot/common/policies/sac/configuration_sac.py b/lerobot/common/policies/sac/configuration_sac.py
index 5f676933..4ae6e5d4 100644
--- a/lerobot/common/policies/sac/configuration_sac.py
+++ b/lerobot/common/policies/sac/configuration_sac.py
@@ -50,6 +50,7 @@ class SACConfig:
     state_encoder_hidden_dim = 256
     latent_dim = 128
     target_entropy = None
+    backup_entropy = True
     critic_network_kwargs = {
         "hidden_dims": [256, 256],
         "activate_final": True,
diff --git a/lerobot/scripts/train.py b/lerobot/scripts/train.py
index fbe7927d..a4eb3528 100644
--- a/lerobot/scripts/train.py
+++ b/lerobot/scripts/train.py
@@ -322,6 +322,11 @@ def train(cfg: DictConfig, out_dir: str | None = None, job_name: str | None = No
 
     logging.info("make_dataset")
     offline_dataset = make_dataset(cfg)
+    # TODO (michel-aractingi): temporary fix to avoid datasets with task_index key that doesn't exist in online environment
+    # i.e., pusht
+    if "task_index" in offline_dataset.hf_dataset[0]:
+        offline_dataset.hf_dataset = offline_dataset.hf_dataset.remove_columns(["task_index"])
+
     if isinstance(offline_dataset, MultiLeRobotDataset):
         logging.info(
             "Multiple datasets were provided. Applied the following index mapping to the provided datasets: "