diff --git a/app/domain/context.py b/app/domain/context.py
index 1de5a13c4..ff6010a47 100644
--- a/app/domain/context.py
+++ b/app/domain/context.py
@@ -1623,11 +1623,18 @@ class MediaInfo:
             if episodes_count:
                 self.seasons[season] = list(range(1, episodes_count + 1))
         # 季年份
-        if self.type == MediaType.TV and not self.season_years:
-            season = self.season if self.season is not None else 1
-            self.season_years = {
-                season: self.year
-            }
+        if not self.season_years:
+            raw_season_years = info.get("season_years")
+            if isinstance(raw_season_years, dict):
+                # 豆瓣榜单偶尔用 null 表示未知年份，避免污染统一响应模型
+                self.season_years = {
+                    season: str(year)
+                    for season, year in raw_season_years.items()
+                    if year is not None
+                }
+            if self.type == MediaType.TV and not self.season_years and self.year:
+                season = self.season if self.season is not None else 1
+                self.season_years = {season: self.year}
         # 风格
         if not self.genres:
             self.genres = [{"id": genre, "name": genre} for genre in info.get("genres") or []]
@@ -1642,6 +1649,8 @@ class MediaInfo:
             self.production_countries = [{"id": country, "name": country} for country in info.get("countries") or []]
         # 剩余属性赋值
         for key, value in info.items():
+            if key == "season_years":
+                continue
             if not value:
                 continue
             if not hasattr(self, key):
diff --git a/tests/test_media_response_models.py b/tests/test_media_response_models.py
index cbef8af03..336284aaa 100644
--- a/tests/test_media_response_models.py
+++ b/tests/test_media_response_models.py
@@ -93,6 +93,34 @@ async def test_media_response_accepts_cross_source_credit_shapes() -> None:
     assert media["directors"][1]["name"] == "导演乙"
 
 
+@pytest.mark.asyncio
+async def test_douban_media_response_filters_unknown_season_years() -> None:
+    """豆瓣榜单的未知季年份不应导致整个媒体列表响应校验失败。"""
+    media = CoreMediaInfo(douban_info={
+        "id": "1292052",
+        "title": "示例电影",
+        "type": "movie",
+        "season_years": {1: None, 2: 2025},
+    })
+    router = ResponseAPIRouter()
+
+    @router.get("/discover/douban_movies", response_model=list[schemas.MediaInfo])
+    def discover_douban_movies() -> list[dict]:
+        """返回包含未知季年份的豆瓣榜单条目。"""
+        return [media.to_dict()]
+
+    app = FastAPI()
+    app.include_router(router)
+    async with AsyncClient(
+        transport=ASGITransport(app=app),
+        base_url="http://testserver",
+    ) as client:
+        response = await client.get("/discover/douban_movies")
+
+    assert response.status_code == 200
+    assert response.json()["data"][0]["season_years"] == {"2": "2025"}
+
+
 @pytest.mark.asyncio
 async def test_media_response_accepts_legacy_source_key() -> None:
     """媒体身份重构前缓存的旧格式条目（source + media_id）应被归一化并正常响应。"""