diff --git a/AsbCloudApp/Services/IDetectedOperationService.cs b/AsbCloudApp/Services/IDetectedOperationService.cs
index 0ba595ff..e4f8f201 100644
--- a/AsbCloudApp/Services/IDetectedOperationService.cs
+++ b/AsbCloudApp/Services/IDetectedOperationService.cs
@@ -35,7 +35,7 @@ namespace AsbCloudApp.Services
         /// <param name="request"></param>
         /// <param name="token"></param>
         /// <returns></returns>
-        Task<IEnumerable<DetectedOperationDto>?> GetOperationsAsync(DetectedOperationRequest request, CancellationToken token);
+        Task<IEnumerable<DetectedOperationDto>> GetOperationsAsync(DetectedOperationRequest request, CancellationToken token);
 
         /// <summary>
         /// Удалить операции
diff --git a/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs b/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs
index 4b58e235..a65525ad 100644
--- a/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs
+++ b/AsbCloudInfrastructure/Services/DetectOperations/DetectedOperationService.cs
@@ -45,17 +45,13 @@ namespace AsbCloudInfrastructure.Services.DetectOperations
             return result;
         }
 
-        public async Task<IEnumerable<DetectedOperationDto>?> GetOperationsAsync(DetectedOperationRequest request, CancellationToken token)
+        public async Task<IEnumerable<DetectedOperationDto>> GetOperationsAsync(DetectedOperationRequest request, CancellationToken token)
         {
             var well = await wellService.GetOrDefaultAsync(request.IdWell, token);
-            if (well?.IdTelemetry is null || well.Timezone is null)
-                return null;
+            if (well?.IdTelemetry is null)
+                return Enumerable.Empty<DetectedOperationDto>();
 
-            var query = BuildQuery(well, request)
-                ?.AsNoTracking();
-
-            if (query is null)
-                return null;
+            var query = BuildQuery(well, request).AsNoTracking();
 
             var data = await query.ToListAsync(token);
 
diff --git a/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs b/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
index 7ff4076a..f7fdea51 100644
--- a/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
+++ b/AsbCloudInfrastructure/Services/Subsystems/SubsystemService.cs
@@ -223,13 +223,11 @@ internal class SubsystemService : ISubsystemService
 
 			var dateRange = telemetryDataSaubService.GetRange(well.Id);
 
-			var beginUTC = gtDate.HasValue
-				? gtDate.Value.ToUtcDateTimeOffset(hoursOffset)
-				: dateRange.From.ToUtcDateTimeOffset(hoursOffset);
+			var beginUTC = gtDate?.ToUtcDateTimeOffset(hoursOffset) 
+							?? dateRange?.From.ToUtcDateTimeOffset(hoursOffset);
 
-			var endUTC = ltDate.HasValue
-				? ltDate.Value.ToUtcDateTimeOffset(hoursOffset)
-				: dateRange.To.ToUtcDateTimeOffset(hoursOffset);
+			var endUTC = ltDate?.ToUtcDateTimeOffset(hoursOffset) 
+						?? dateRange?.To.ToUtcDateTimeOffset(hoursOffset);
 
 			var request = new DetectedOperationRequest
 			{