the balearic islands cause trouble. Maybe its a wrong split from osmconvert (eurpe->iberia->balearen), but r-4839 works weill.

13:43:23,46 - splitter Speiche_Balearen
Warning: --keep-complete is only used for the first input file. Further files must use higher ids.
13:44:06,30 - mkgmap .\tools\mkgmap-r4845 Speiche_Balearen
Exception in thread "main" java.lang.AssertionError: no outer way in partition
at uk.me.parabola.mkgmap.reader.osm.MultiPolygonRelation.processPartition(MultiPolygonRelation.java:705)
at uk.me.parabola.mkgmap.reader.osm.MultiPolygonRelation.processElements(MultiPolygonRelation.java:622)
at uk.me.parabola.mkgmap.reader.osm.ElementSaver.addRelation(ElementSaver.java:163)
at uk.me.parabola.mkgmap.reader.osm.bin.OsmBinHandler$BinParser.parseRelations(OsmBinHandler.java:215)
at crosby.binary.BinaryParser.parse(Unknown Source)
at crosby.binary.BinaryParser.handleBlock(Unknown Source)
at crosby.binary.file.FileBlock.process(Unknown Source)
at crosby.binary.file.BlockInputStream.process(Unknown Source)
at uk.me.parabola.mkgmap.reader.osm.bin.OsmBinHandler.parse(OsmBinHandler.java:54)
at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.parse(OsmMapDataSource.java:167)
at uk.me.parabola.mkgmap.reader.osm.OsmMapDataSource.load(OsmMapDataSource.java:142)
at uk.me.parabola.mkgmap.main.MapMaker.loadFromFile(MapMaker.java:165)
at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:58)
at uk.me.parabola.mkgmap.main.Main.lambda$processFilename$1(Main.java:291)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)

Greetz

Arndt