diff --git a/src/Intersvyaz.Net/IntersvyazClient.cs b/src/Intersvyaz.Net/IntersvyazClient.cs
index e47d75e..8a67241 100644
--- a/src/Intersvyaz.Net/IntersvyazClient.cs
+++ b/src/Intersvyaz.Net/IntersvyazClient.cs
@@ -72,7 +72,7 @@ namespace Intersvyaz.Net
 
                 _httpClient.DefaultRequestHeaders.Authorization =
                     new AuthenticationHeaderValue("Bearer", result.Token);
-                OnLogin.Invoke(this, result);
+                OnLogin?.Invoke(this, result);
 
                 return result;
             }