diff --git a/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs b/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs
index 21c06f91..cef39758 100644
--- a/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs
+++ b/AsbCloudInfrastructure/Services/TelemetryAnalyticsService.cs
@@ -323,13 +323,15 @@ namespace AsbCloudInfrastructure.Services
                                     .DefaultIfEmpty()
                                     .Last();
 
-            var lastAnalysisUnixDate = lastAnalysisInDb?.UnixDate ?? 0;
+            var lastAnalysisUnixDate = lastAnalysisInDb?.UnixDate ?? default;
 
-            var analyzeStartDate = DateTimeOffset.FromUnixTimeSeconds(lastAnalysisUnixDate);
+            var analyzeStartDate = lastAnalysisUnixDate == default
+                                   ? DateTimeOffset.MinValue
+                                   : DateTimeOffset.FromUnixTimeSeconds(lastAnalysisUnixDate);
 
             var firstDataSaub = (from ds in db.TelemetryDataSaub
                                  where ds.IdTelemetry == idTelemetry &&
-                                 ds.Date > analyzeStartDate
+                                 ds.Date >= analyzeStartDate
                                  select ds).FirstOrDefault();
 
             var firstSaubUtcTime = firstDataSaub.Date.ToUniversalTime();