I too ran into problems using the patch (on Austria from geofabrik): java.lang.NullPointerException at uk.me.parabola.mkgmap.reader.osm.MultiPolygonRelation.cutOutInnerPolygons(MultiPolygonRelation.java:892) at uk.me.parabola.mkgmap.reader.osm.MultiPolygonRelation.processElements(MultiPolygonRelation.java:640) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5XmlHandler.endRelation(Osm5XmlHandler.java:569) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5XmlHandler.endElement(Osm5XmlHandler.java:539) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source) at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(Unknown Source) at uk.me.parabola.mkgmap.reader.osm.xml.Osm5MapDataSource.load(Osm5MapDataSource.java:81) at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:148) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:56) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:189) at uk.me.parabola.mkgmap.main.Main$1.call(Main.java:186) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Exiting - if you want to carry on regardless, use the --keep-going option 16:35:25 Maybe both Marko and me am using some other patches that break something here? --- therefore attached my patches to mkgmap I'm currently using (except a bit copyright info changes for maps created, mainly a patch to change dp filter independantly for polygons).