diff --git a/src/net45/WampSharp/WAMP2/V2/Core/Contracts/WampException.cs b/src/net45/WampSharp/WAMP2/V2/Core/Contracts/WampException.cs
index 7b408feca..1c781f3e3 100644
--- a/src/net45/WampSharp/WAMP2/V2/Core/Contracts/WampException.cs
+++ b/src/net45/WampSharp/WAMP2/V2/Core/Contracts/WampException.cs
@@ -38,7 +38,7 @@ public WampException(IDictionary<string, object> details, string errorUri, objec
                              IDictionary<string, object> argumentsKeywords) : base(errorUri)
         {
             mErrorUri = errorUri;
-            mDetails = details;
+            mDetails = details ?? mEmptyDetails;
             mArguments = arguments;
             mArgumentsKeywords = argumentsKeywords;
         }
@@ -48,7 +48,7 @@ public WampException(IDictionary<string, object> details, string errorUri, strin
             : base(message)
         {
             mErrorUri = errorUri;
-            mDetails = details;
+            mDetails = details ?? mEmptyDetails;
             mArguments = new object[] {message};
             mArgumentsKeywords = argumentsKeywords;
         }
@@ -66,7 +66,7 @@ public WampException(IDictionary<string, object> details, string errorUri, objec
             : base(message, inner)
         {
             mErrorUri = errorUri;
-            mDetails = details;
+            mDetails = details ?? mEmptyDetails;
             mArguments = arguments;
             mArgumentsKeywords = argumentsKeywords;
         }