[mkgmap-dev] Splitter Error

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$OSMWriterWorker.processElement(SplitP rocessor.java:407) at uk.me.parabola.splitter.SplitProcessor$OSMWriterWorker.run(SplitProcessor.ja va:442) at java.lang.Thread.run(Thread.java:679) What does this mean?