diff --git a/Src/Dlhis.Basic/WorkGrids/Services/Implements/WorkGridService.cs b/Src/Dlhis.Basic/WorkGrids/Services/Implements/WorkGridService.cs
index 3a2d95a4..2bfc0c79 100644
--- a/Src/Dlhis.Basic/WorkGrids/Services/Implements/WorkGridService.cs
+++ b/Src/Dlhis.Basic/WorkGrids/Services/Implements/WorkGridService.cs
@@ -60,11 +60,14 @@ public class WorkGridService : IWorkGridService
             .ToPageListAsync(request);
 
         var userCodes = r.Data.Select(x => x.Code).ToList();
-        var maximumConsecutiveUserCodes = await _workGridScheduleService.MaximumConsecutiveUserCodesAsync(userCodes, 1, DateOnly.FromDateTime(request.Date));
-
-        foreach (var item in r.Data)
+        if (userCodes.Any())
         {
-            item.MaximumConsecutiveSchedules = maximumConsecutiveUserCodes.FirstOrDefault(x => x.UserCode == item.Code);
+            var maximumConsecutiveUserCodes = await _workGridScheduleService.MaximumConsecutiveUserCodesAsync(userCodes, 1, DateOnly.FromDateTime(request.Date));
+
+            foreach (var item in r.Data)
+            {
+                item.MaximumConsecutiveSchedules = maximumConsecutiveUserCodes.FirstOrDefault(x => x.UserCode == item.Code);
+            }
         }
 
         return r;