diff --git a/YD_YiLu/Services/Impl/DeviceSyncService.cs b/YD_YiLu/Services/Impl/DeviceSyncService.cs
index 60246b0..1da24a3 100644
--- a/YD_YiLu/Services/Impl/DeviceSyncService.cs
+++ b/YD_YiLu/Services/Impl/DeviceSyncService.cs
@@ -521,7 +521,7 @@ namespace YD_YiLu.Api.Services.Impl
                         select new { t, s };
 
             // 5️⃣ 条件过滤
-            if (dto.CourseId.HasValue)
+            if (dto.CourseId > 0)
                 query = query.Where(x => x.t.CourseId == dto.CourseId.Value);
 
             if (dto.Gender > 0)
@@ -803,7 +803,7 @@ namespace YD_YiLu.Api.Services.Impl
                         select new { t, s };
 
             // 👉 4. 条件过滤
-            if (dto.CourseId.HasValue)
+            if (dto.CourseId > 0)
                 query = query.Where(x => x.t.CourseId == dto.CourseId.Value);
 
             if (dto.Gender > 0)