Version mkgmap-r3996 was committed by gerd on Mon, 11 Sep 2017 add test to avoid rare NPE in HousenumberGenerator.useAddrPlaceTag() A rare combination of addr:place, addr:street and a way with addr:interpolation in combination with missing road name seems to cause this. Did not find the right place to fix it, so the data is now simply ignored. http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3996