--- C:/workspace/poi/org/apache/poi/hssf/dev/BiffViewer.java	(revision 501957)
+++ C:/workspace/poi/org/apache/poi/hssf/dev/BiffViewer.java	(working copy)
@@ -621,7 +621,7 @@ 
         super(in);
       }
       public void dumpBytes() {
-        HexDump.dump(this.data, 0, this.currentLength);
+        HexDump.dump(this.data, 0, Math.max(0,this.currentLength - 1));
       }
     }