Update

jsonrpc/__init__.py

@@ -156,12 +156,12 @@ class JSONRPC:
         try:
             if method.handler is None:
                 pass
-            if isinstance(params, list):
+            if params is None:
+                response = method.function()
+            elif isinstance(params, list):
                 response = method.function(*params)
             elif isinstance(params, dict):
                 response = method.function(**params)
-            elif isinstance(params, NoneType):
-                response = method.function()
             else:
                 return JsonRpcException(
                     query['id'],