1 files changed, 1 insertions, 2 deletions
diff --git a/src/DotNetOpenAuth/OpenId/Behaviors/PpidGeneration.cs b/src/DotNetOpenAuth/OpenId/Behaviors/PpidGeneration.cs
index f09e886..baef943 100644
--- a/src/DotNetOpenAuth/OpenId/Behaviors/PpidGeneration.cs
+++ b/src/DotNetOpenAuth/OpenId/Behaviors/PpidGeneration.cs
@@ -7,6 +7,7 @@
 namespace DotNetOpenAuth.OpenId.Behaviors {
 	using System;
 	using System.Diagnostics.CodeAnalysis;
+	using System.Diagnostics.Contracts;
 	using System.Linq;
 	using DotNetOpenAuth.Messaging;
 	using DotNetOpenAuth.OpenId.Extensions.ProviderAuthenticationPolicy;
@@ -73,8 +74,6 @@ namespace DotNetOpenAuth.OpenId.Behaviors {
 		/// from handling it; <c>false</c> to allow other behaviors to process this request.
 		/// </returns>
 		bool IProviderBehavior.OnOutgoingResponse(IAuthenticationRequest request) {
-			ErrorUtilities.VerifyArgumentNotNull(request, "request");
-
 			// Nothing to do for negative assertions.
 			if (!request.IsAuthenticated.Value) {
 				return false;