diff --git a/tests/MongoDB.Driver.TestHelpers/DriverTestConfiguration.cs b/tests/MongoDB.Driver.TestHelpers/DriverTestConfiguration.cs
index e543171489f..8baf5fd6200 100644
--- a/tests/MongoDB.Driver.TestHelpers/DriverTestConfiguration.cs
+++ b/tests/MongoDB.Driver.TestHelpers/DriverTestConfiguration.cs
@@ -162,7 +162,7 @@ public static MongoClient CreateClient(
             clientSettings.ServerApi = CoreTestConfiguration.ServerApi;
             clientSettingsConfigurator?.Invoke(clientSettings);
 
-            if (clientSettings.Credential.Mechanism == MongoOidcAuthenticator.MechanismName)
+            if (clientSettings.Credential?.Mechanism == MongoOidcAuthenticator.MechanismName)
             {
                 OidcCallbackAdapterCachingFactory.Instance.Reset();
             }