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-rw-r--r--src/DotNetOAuth/ChannelElements/OAuthChannel.cs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/DotNetOAuth/ChannelElements/OAuthChannel.cs b/src/DotNetOAuth/ChannelElements/OAuthChannel.cs
index 16e7006..7ac4527 100644
--- a/src/DotNetOAuth/ChannelElements/OAuthChannel.cs
+++ b/src/DotNetOAuth/ChannelElements/OAuthChannel.cs
@@ -236,6 +236,8 @@ namespace DotNetOAuth.ChannelElements {
/// This method implements spec V1.0 section 5.3.
/// </remarks>
protected override Response SendDirectMessageResponse(IProtocolMessage response) {
+ if (response == null) throw new ArgumentNullException("response");
+
MessageSerializer serializer = MessageSerializer.Get(response.GetType());
var fields = serializer.Serialize(response);
string responseBody = MessagingUtilities.CreateQueryString(fields);