diff --git a/AsbCloudApp/Services/IDetectedOperationService.cs b/AsbCloudApp/Services/IDetectedOperationService.cs
index aaa5cc1c..14a05665 100644
--- a/AsbCloudApp/Services/IDetectedOperationService.cs
+++ b/AsbCloudApp/Services/IDetectedOperationService.cs
@@ -45,7 +45,6 @@ namespace AsbCloudApp.Services
         /// <param name="request"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-
         Task<int> DeleteAsync(DetectedOperationRequest request, CancellationToken token);
 
         /// <summary>
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
index dd7b56ce..28405e81 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemOperationTimeService.cs
@@ -97,6 +97,8 @@ namespace AsbCloudInfrastructure.Services.Subsystems
                 GtDate = request.GtDate,
             };
             var detectedOperations = await detectedOperationService.GetOperationsAsync(detectedOperationsRequest, token);
+            if(detectedOperations?.Any() != true)
+                return null;
             var depthInterval = GetDepthInterval(detectedOperations);
 
             var statList = CalcStat(data,depthInterval,request, token);
@@ -150,20 +152,20 @@ namespace AsbCloudInfrastructure.Services.Subsystems
 
             return result;
         }
-        private (double,double) GetDepthInterval (IEnumerable<DetectedOperationDto>? detectedOperations)
+        private (double depthIntervalRotor, double depthIntervalSlide) GetDepthInterval (IEnumerable<DetectedOperationDto> detectedOperations)
         {            
-            var depthInterval = (depthIntervalRotor:(double)0, depthIntervalSlide: (double)0);
-            if (detectedOperations is null)
-                return depthInterval;
-            depthInterval.depthIntervalRotor = detectedOperations.Where(o => o.IdCategory == 1)
+             
+            var depthIntervalRotor = detectedOperations.Where(o => o.IdCategory == 1)
                     .Sum(o => o.DepthEnd - o.DepthStart);
-            depthInterval.depthIntervalSlide = detectedOperations.Where(o => o.IdCategory == 3)
-                    .Sum(o => o.DepthEnd - o.DepthStart);            
+            var depthIntervalSlide = detectedOperations.Where(o => o.IdCategory == 3)
+                    .Sum(o => o.DepthEnd - o.DepthStart);
+            var depthInterval = (depthIntervalRotor, depthIntervalSlide);
+
             return depthInterval;
         }
         private double GetDepthIntervalSubsystem(int idSubsystem, (double depthIntervalRotor, double depthIntervalSlide) depthInterval)
         {
-            double depthIntervalSubsystem = 0;
+            var depthIntervalSubsystem = 0d;
             //AKB - MSE
             if (idSubsystem == 1 | idSubsystem == 2)
             {