--- a/UndefinedObject.st	Mon Dec 03 18:06:42 2018 +0100
+++ b/UndefinedObject.st	Mon Dec 03 18:07:46 2018 +0100
@@ -267,7 +267,17 @@
 dependents
     "nil has no dependents"
 
-    ^#()
+    ^ #()
+
+    "Modified (format): / 30-11-2018 / 18:03:27 / Stefan Vogel"
+!
+
+onChangeSend:selector to:someOne
+    "raise an error here - nil may not have dependents (it never changes anyway)"
+
+    self proceedableError:'nil may not have dependents'
+
+    "Created: / 30-11-2018 / 18:03:49 / Stefan Vogel"
 !
 
 release