--- a/NonPositionableExternalStream.st	Tue Sep 03 09:57:12 2019 +0200
+++ b/NonPositionableExternalStream.st	Tue Sep 03 09:58:38 2019 +0200
@@ -297,6 +297,9 @@
 setCommandString:dummyString
     "dummy for PipeStream compatibility"
 
+    "/ intentionally ignore here
+    ^ self
+
     "Created: / 29-10-2018 / 18:06:44 / Claus Gittinger"
 ! !