diff --git a/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSaubService.cs b/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSaubService.cs
index 885edc03..88ba617d 100644
--- a/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSaubService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/TelemetryDataSaubService.cs
@@ -121,7 +121,8 @@ namespace AsbCloudInfrastructure.Services.SAUB
                 _ => 32_768
             };
 
-            var data = await GetOrDefaultAsync(idWell, beginDate, intervalSec, approxPointsCount, token );
+            var data = await GetOrDefaultAsync(idWell, beginDate, intervalSec, approxPointsCount, token )
+                ?? Enumerable.Empty<TelemetryDataSaubDto>();
 
             var fileName = $"DataSaub idWell{idWell}";
             if (telemetry.Info is not null)
diff --git a/AsbCloudWebApi.Tests/Middlware/UserConnectionsLimitMiddlwareTest.cs b/AsbCloudWebApi.Tests/Middlware/UserConnectionsLimitMiddlwareTest.cs
index 7c2166be..78abcb1d 100644
--- a/AsbCloudWebApi.Tests/Middlware/UserConnectionsLimitMiddlwareTest.cs
+++ b/AsbCloudWebApi.Tests/Middlware/UserConnectionsLimitMiddlwareTest.cs
@@ -6,6 +6,7 @@ using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Hosting;
 using System;
 using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Net.Http;
 using System.Threading;
@@ -42,6 +43,11 @@ namespace AsbCloudWebApi.Tests.Middlware
 
             public Task<IEnumerable<TelemetryDataSaubStatDto>> GetTelemetryDataStatAsync(int idTelemetry, CancellationToken token) => throw new NotImplementedException();
 
+            public Task<Stream> GetZippedCsv(int idWell, DateTime beginDate, DateTime endDate, CancellationToken token)
+            {
+                throw new NotImplementedException();
+            }
+
             public Task<int> UpdateDataAsync(string uid, IEnumerable<TelemetryDataSaubDto> dtos, CancellationToken token) => throw new NotImplementedException();
         }