--- a/WeakValueDictionary.st	Thu Jun 06 23:26:13 2019 +0200
+++ b/WeakValueDictionary.st	Thu Jun 06 23:26:20 2019 +0200
@@ -130,7 +130,7 @@
      are added within interrupting high prio processes."
 
     (anObject isNil or:[anObject class == SmallInteger]) ifTrue:[
-        self error:'WeakValueDictionary: invalid value'.
+        ArgumentError raise.
     ].
 
     (OperatingSystem blockInterrupts) ifTrue:[
@@ -147,6 +147,7 @@
     "Modified: / 06-05-1996 / 12:22:26 / stefan"
     "Modified: / 29-01-1997 / 15:08:45 / cg"
     "Modified: / 12-02-2019 / 20:36:16 / Stefan Vogel"
+    "Modified: / 06-06-2019 / 23:25:42 / Claus Gittinger"
 !
 
 removeIdentityValue:aValue ifAbsent:aBlock