fixup

esrftaskgraph/esrftaskgraph/hashing.py

@@ -118,10 +118,12 @@ class UniversalHashable:
         self.__instance_nonce = uhash_nonce
         self.__original__instance_nonce = uhash_nonce
 
-    def __init_subclass__(cls, version=None, **kwargs):
+    def __init_subclass__(subcls, version=None, **kwargs):
         super().__init_subclass__(**kwargs)
-        cls.__VERSION = version
-        cls.__CLASS_NONCE = str(uhash((cls.class_nonce(), ) + cls.class_nonce_data()))
+        supercls_data = subcls.class_nonce()
+        subcls.__VERSION = version
+        subcls_data = subcls.class_nonce_data()
+        subcls.__CLASS_NONCE = str(uhash((subcls_data, supercls_data)))
 
     @classmethod
     def class_nonce(cls):