diff --git a/AsbCloudApp/Comparators/TelemetryUserDtoComparer.cs b/AsbCloudApp/Comparators/TelemetryUserDtoComparer.cs
new file mode 100644
index 00000000..48b497a9
--- /dev/null
+++ b/AsbCloudApp/Comparators/TelemetryUserDtoComparer.cs
@@ -0,0 +1,20 @@
+using AsbCloudApp.Data;
+using System.Collections.Generic;
+
+namespace AsbCloudApp.Comparators
+{
+    public class TelemetryUserDtoComparer : IEqualityComparer<TelemetryUserDto>
+    {
+        public bool Equals(TelemetryUserDto prevUser, TelemetryUserDto nextUser)
+        {
+            if (prevUser is null || nextUser is null)
+                return false;
+            else if (prevUser.Id == nextUser.Id)
+                return true;
+            else
+                return false;
+        }
+
+        public int GetHashCode(TelemetryUserDto user) => user.Id.GetHashCode();
+    }
+}
diff --git a/AsbCloudInfrastructure/Services/TelemetryUserService.cs b/AsbCloudInfrastructure/Services/TelemetryUserService.cs
index 21e7e924..17e46196 100644
--- a/AsbCloudInfrastructure/Services/TelemetryUserService.cs
+++ b/AsbCloudInfrastructure/Services/TelemetryUserService.cs
@@ -1,5 +1,6 @@
 using AsbCloudApp.Data;
 using AsbCloudApp.Services;
+using AsbCloudApp.Comparators;
 using AsbCloudDb.Model;
 using AsbCloudInfrastructure.Services.Cache;
 using System.Collections.Generic;
@@ -25,6 +26,8 @@ namespace AsbCloudInfrastructure.Services
             if (!dtos.Any())
                 return;
 
+            dtos = dtos.Distinct(new TelemetryUserDtoComparer());
+
             var telemetryId = telemetryService.GetOrCreateTemetryIdByUid(uid);
 
             var ids = dtos.Select(e => e.Id).ToList();