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-rw-r--r--src/DotNetOpenId/Extensions/SimpleRegistration/ClaimsRequest.cs3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/DotNetOpenId/Extensions/SimpleRegistration/ClaimsRequest.cs b/src/DotNetOpenId/Extensions/SimpleRegistration/ClaimsRequest.cs
index e5d282e..aab0608 100644
--- a/src/DotNetOpenId/Extensions/SimpleRegistration/ClaimsRequest.cs
+++ b/src/DotNetOpenId/Extensions/SimpleRegistration/ClaimsRequest.cs
@@ -183,6 +183,9 @@ namespace DotNetOpenId.Extensions.SimpleRegistration {
/// version of Simple Registration used in the request message.
/// </summary>
public ClaimsResponse CreateResponse() {
+ if (typeUriDeserializedFrom == null) {
+ throw new InvalidOperationException(Strings.CallDeserializeBeforeCreateResponse);
+ }
return new ClaimsResponse(typeUriDeserializedFrom);
}