diff --git a/src/RestSharp/RestClient.cs b/src/RestSharp/RestClient.cs
index ae1a97460..ead6b3553 100644
--- a/src/RestSharp/RestClient.cs
+++ b/src/RestSharp/RestClient.cs
@@ -673,7 +673,8 @@ IRestResponse<T> Deserialize<T>(IRestRequest request, IRestResponse raw)
                 // be deserialized 
                 if (response.ErrorException == null)
                 {
-                    var handler = GetHandler(raw.ContentType)();
+                    var func = GetHandler(raw.ContentType);
+                    var handler = func?.Invoke();
 
                     // Only continue if there is a handler defined else there is no way to deserialize the data.
                     // This can happen when a request returns for example a 404 page instead of the requested JSON/XML resource
@@ -743,4 +744,4 @@ public UrlSegmentParamsValues(Uri builderUri, string assembled)
             public string Resource { get; }
         }
     }
-}
\ No newline at end of file
+}