--- a/ReadWriteStream.st	Tue May 08 20:01:24 2018 +0200
+++ b/ReadWriteStream.st	Tue May 08 20:20:43 2018 +0200
@@ -130,7 +130,9 @@
      Because I am a read/write stream, the readLimit is set to the current write position.
      Thus, the just written data can be read back."
 
-    readLimit := position max:readLimit.
+    readLimit notNil ifTrue:[
+        readLimit := position max:readLimit.
+    ].
     position := 0.
 !