diff --git a/app/domain/meta/words.py b/app/domain/meta/words.py
index 7ca392998..7f67b5e54 100644
--- a/app/domain/meta/words.py
+++ b/app/domain/meta/words.py
@@ -129,7 +129,7 @@ class WordsMatcher(metaclass=Singleton):
         self,
         title: str,
         subtitle: Optional[str] = None,
-        custom_words: List[str] = None,
+        custom_words: Optional[List[str]] = None,
     ) -> Tuple[str, Optional[str], List[str]]:
         """
         预处理标题和副标题，支持跨字段应用集数偏移规则。
@@ -145,7 +145,7 @@ class WordsMatcher(metaclass=Singleton):
         self,
         title: str,
         subtitle: Optional[str],
-        custom_words: List[str] = None,
+        custom_words: Optional[List[str]] = None,
     ) -> Tuple[str, Optional[str], List[str]]:
         """按识别词顺序处理标题，并在需要时更新副标题中的集数。"""
         appley_words = []
diff --git a/tests/fixtures/architecture/mypy-baseline.json b/tests/fixtures/architecture/mypy-baseline.json
index 523b4b322..0d6e1b70a 100644
--- a/tests/fixtures/architecture/mypy-baseline.json
+++ b/tests/fixtures/architecture/mypy-baseline.json
@@ -1282,7 +1282,7 @@
     "operator": 1
   },
   "app/domain/metainfo.py": {
-    "arg-type": 6,
+    "arg-type": 5,
     "assignment": 4,
     "no-untyped-call": 3,
     "no-untyped-def": 1,