diff --git a/AsbCloudInfrastructure/Services/SAUB/TelemetryService.cs b/AsbCloudInfrastructure/Services/SAUB/TelemetryService.cs
index 811f9beb..4a62b225 100644
--- a/AsbCloudInfrastructure/Services/SAUB/TelemetryService.cs
+++ b/AsbCloudInfrastructure/Services/SAUB/TelemetryService.cs
@@ -95,7 +95,7 @@ namespace AsbCloudInfrastructure.Services.SAUB
         {
             var entity = GetTelemetryCache()
                 .FirstOrDefault(t => t.Well?.Id == idWell);
-            if (entity.Well?.Timezone is not null && entity.TimeZone.Hours != entity.Well.Timezone.Hours)
+            if (entity?.Well?.Timezone is not null && entity.TimeZone.Hours != entity.Well.Timezone.Hours)
             {
                 entity.TimeZone = entity.Well.Timezone;
                 //TODO: выдаем предупреждение!