I receive an error when running the current splitter version:

Exception in thread "worker-6" java.lang.StringIndexOutOfBoundsException: String index out of range: -3

                at java.lang.String.getChars(String.java:860)

                at uk.me.parabola.splitter.OSMXMLWriter.writeString(OSMXMLWriter.java:199)

                at uk.me.parabola.splitter.OSMXMLWriter.write(OSMXMLWriter.java:96)

                at uk.me.parabola.splitter.SplitProcessor$OSMWriterWorker.processElement(SplitProcessor.java:407)

                at uk.me.parabola.splitter.SplitProcessor$OSMWriterWorker.run(SplitProcessor.java:442)

                at java.lang.Thread.run(Thread.java:679)

What does this mean?