diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
index ed2571a9..d2400ba3 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
@@ -67,22 +67,16 @@ internal class SubsystemService : ISubsystemService
 
             var detectedOperations = await detectedOperationService
                 .GetOperationsAsync(byWellRequest, token);
+            var detectedOperationsByCurrentDriller = detectedOperations.Where(d => d.Driller?.Id == schedule.IdDriller);
 
-            var groupByDriller = detectedOperations
-                .Where(operation => operation.Driller is not null)
-                .GroupBy(operation => operation.Driller);
-
-            foreach (var entry in groupByDriller)
+            var drillerOperationsStat = await CalcStatAsync(detectedOperationsByCurrentDriller, token);
+            var dto = new DrillerDetectedOperationStatDto
             {
-                var drillerOperationsStat = await CalcStatAsync(entry, token);
-                var dto = new DrillerDetectedOperationStatDto
-                {
-                    Statistic = drillerOperationsStat,
-                    Schedule = schedule,
-                    Well = well,
-                };
-                result.Add(dto);
-            }
+                Statistic = drillerOperationsStat,
+                Schedule = schedule,
+                Well = well,
+            };
+            result.Add(dto);
         }
 
         return result;