diff --git a/alembic_labelu/versions/9d5da133bbe4_replace_key_with_value_in_sample_table.py b/alembic_labelu/versions/9d5da133bbe4_replace_key_with_value_in_sample_table.py
index 920340cb..2bce54dc 100644
--- a/alembic_labelu/versions/9d5da133bbe4_replace_key_with_value_in_sample_table.py
+++ b/alembic_labelu/versions/9d5da133bbe4_replace_key_with_value_in_sample_table.py
@@ -57,41 +57,37 @@ def upgrade() -> None:
                     if label.get("key"):
                         label_dict[label.get("key")] = label.get("value")
 
-            # replace key with value in the sample of current task if label_dict is not null
-            if len(label_dict) > 0:
-                # get the sample data items of the task id
-                sample_items = session.execute(
-                    f"SELECT id, data FROM task_sample WHERE task_id={task_id}"
-                )
-                for sample_item in sample_items:
-                    sample_id = sample_item[0]
-                    sample_data_item = json.loads(sample_item[1])
-                    sample_annotated_result = json.loads(sample_data_item.get("result"))
-                    if sample_annotated_result:
-                        for sample_tool in sample_annotated_result.keys():
-                            if sample_tool.endswith("Tool"):
-                                for sample_tool_result in sample_annotated_result.get(
-                                    sample_tool
-                                ).get("result", []):
-                                    tool_label = sample_tool_result.get("attribute", "")
-                                    if tool_label in label_dict:
-                                        sample_tool_result["attribute"] = label_dict[
-                                            tool_label
-                                        ]
-                        sample_data_item["result"] = json.dumps(
-                            sample_annotated_result, ensure_ascii=False
-                        )
-                        sample_annotated_item_str = json.dumps(
-                            sample_data_item, ensure_ascii=False
-                        )
-                        op.execute(
-                            update(task_sample)
-                            .where(task_sample.id == sample_id)
-                            .where(
-                                task_sample.task_id == task_id,
-                            )
-                            .values({task_sample.data: sample_annotated_item_str})
-                        )
+            # replace key with value in the sample of current task
+            # get the sample data items of the task id
+            sample_items = session.execute(
+                f"SELECT id, data FROM task_sample WHERE task_id={task_id}"
+            )
+            for sample_item in sample_items:
+                sample_id = sample_item[0]
+                sample_data_item = json.loads(sample_item[1])
+                sample_annotated_result = json.loads(sample_data_item.get("result"))
+                if sample_annotated_result:
+                    for sample_tool in sample_annotated_result.keys():
+                        if sample_tool.endswith("Tool"):
+                            for sample_tool_result in sample_annotated_result.get(
+                                sample_tool
+                            ).get("result", []):
+                                tool_label = sample_tool_result.get("attribute", "")
+                                if tool_label in label_dict:
+                                    sample_tool_result["attribute"] = label_dict[
+                                        tool_label
+                                    ]
+                    sample_data_item["result"] = json.dumps(
+                        sample_annotated_result, ensure_ascii=False
+                    )
+                    sample_annotated_item_str = json.dumps(
+                        sample_data_item, ensure_ascii=False
+                    )
+                    op.execute(
+                        update(task_sample)
+                        .where(task_sample.id == sample_id)
+                        .values({task_sample.data: sample_annotated_item_str})
+                    )
 
 
 def downgrade() -> None: