Hi Andrzej, your patch reverts that change that I made r4048 to solve your problems with empty areas. Maybe it is no longer needed since 4101? http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2018q1/027704.html Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Andrzej Popowski <popej@poczta.onet.pl> Gesendet: Samstag, 3. Februar 2018 20:39 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] My findings about the crash in MapSource Hi Gerd, I have compiled baddem6 and I confirm your observations. I have no idea, what to do with it. I have found a minor error, see attached patch. Mkgmap calculates min/max heights for header using values form tiles, which have bitstream data. This is wrong for flat surfaces, which have height but no bitstream and for voids, which have bitstream without real heights. I also removed bitstream for tiles with all voids, but I don't know the reason for putting it in first place, so maybe it is wrong change. -- Best regards, Andrzej