diff --git a/AsbCloudWebApi/ProtobufModel.cs b/AsbCloudWebApi/ProtobufModel.cs
index fb3479e2..fc8b9995 100644
--- a/AsbCloudWebApi/ProtobufModel.cs
+++ b/AsbCloudWebApi/ProtobufModel.cs
@@ -5,13 +5,18 @@ namespace AsbCloudWebApi
 {
     public static class ProtobufModel
     {
+        private static readonly object SyncRoot = new();
+
         public static void EnshureRegistered()
         {
-            EnshureRegisteredDataSpin();
-            EnshureRegisteredDataSaub();
-            EnshureRegisteredWITS();
-            EnshureRegisteredWirelineRunOutBaseDto();
-            EnshureRegisteredWirelineRunOutDto();
+            lock (SyncRoot)
+            {
+                EnshureRegisteredDataSpin();
+                EnshureRegisteredDataSaub();
+                EnshureRegisteredWITS();
+                EnshureRegisteredWirelineRunOutBaseDto();
+                EnshureRegisteredWirelineRunOutDto();
+            }
         }
 
         private static void EnshureRegisteredWirelineRunOutBaseDto()