I use always the compiled version from mkgmap-download-page. Also other maps were fine. The Map of Germany is the biggest one with 106 tiles and about 1.37gb. Last week with 2018 (I think) everything was ok.Hi Henning, do you have got a completely fresh version of mkgmap? Once I had also similiar errors, they were gone with a really fresh version of the sources. I had removed my local sources completely and had downloaded the mkgmap sources again.