diff --git a/pyproject.toml b/pyproject.toml
index 8d9f3ad..df5000d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,6 +5,7 @@ description = "Add your description here"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
+    "loguru>=0.7.3",
     "orjson>=3.11.1",
     "polars>=1.32.0",
     "pyecharts>=2.0.8",
diff --git a/utils/flat_user_detail.py b/utils/flat_user_detail.py
index 2c1fa80..b2e6377 100644
--- a/utils/flat_user_detail.py
+++ b/utils/flat_user_detail.py
@@ -7,6 +7,7 @@ import polars as pl
 import orjson as json
 import pyecharts.options as opts
 from pyecharts.charts import Scatter
+from loguru import logger
 
 
 from helpers import query_music_db, find_level, dx_rating
@@ -17,15 +18,17 @@ def calculate_dxrating(music: dict):
     level_id = music["level"]
     ach = music["achievement"]
     music_info = query_music_db(music_id)
+    if not music_info:
+        logger.error(f"music: {music_id} not found")
+        return music | {"dxRating": 0}
     level = find_level(music_info, level_id)
 
     try:
         return music | {"dxRating": dx_rating(Decimal(level.pop()["difficulty"]), ach)}
     except IndexError as _:
-        print(f"unknown level: {music_id} - {level_id}", file=stderr)
+        logger.warning(f"unknown level: {music_id} - {level_id}", file=stderr)
         return music | {"dxRating": 0}
 
-
 data = json.loads(stdin.buffer.read())
 user_id = data["userId"]
 music_list: list[dict[str, dict]] = data["userMusicList"]