diff --git a/SharedLibraryCore/PartialEntities/EFClient.cs b/SharedLibraryCore/PartialEntities/EFClient.cs
index 01ba29822..b4bae5ac9 100644
--- a/SharedLibraryCore/PartialEntities/EFClient.cs
+++ b/SharedLibraryCore/PartialEntities/EFClient.cs
@@ -80,7 +80,7 @@ public virtual int? IPAddress
             set => CurrentAlias.IPAddress = value;
         }
 
-        [NotMapped] public string IPAddressString => IPAddress.ConvertIPtoString();
+        [NotMapped] public string IPAddressString => IPAddress is null ? null : IPAddress.ConvertIPtoString();
 
         [NotMapped] public bool IsIngame => ClientNumber >= 0;