Hi Philip

In the short term, try removing the -ea option from your java command. This
should stop this crash but the part of resultant map might be rubbish or the bit
might be not noticeable. I'll have a look sometime to see if I can work out why
it is generating a value that won't fit into the allocated #bits in the .img
file.

Ticker 

On Thu, 2025-09-18 at 12:10 +0200, Philip Homburg via mkgmap-dev wrote:
> Hi,
> 
> I got the following trying to make a map of Croatia with contour lines. It
> works fine without. Or for example for Slovenia. Anybody a clue where I
> should look for the cause of this problem? It crashes already in the first
> pbf generated by the splitter. I can put the pbf somewhere if that helps.
> 
> kgmap version 4923
> Time started: Thu Sep 18 11:51:06 CEST 2025
> Exception in thread "main" java.lang.AssertionError: 65536
>         at
> uk.me.parabola.imgfmt.app.BufferedImgFileWriter.put2u(BufferedImgFileWriter.ja
> va:166)
>         at
> uk.me.parabola.imgfmt.app.trergn.Subdivision.write(Subdivision.java:285)
>         at
> uk.me.parabola.imgfmt.app.trergn.TREFile.writeSubdivs(TREFile.java:169)
>         at
> uk.me.parabola.imgfmt.app.trergn.TREFile.writeBody(TREFile.java:124)
>         at uk.me.parabola.imgfmt.app.trergn.TREFile.write(TREFile.java:341)
>         at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:342)
>         at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:114)
>         at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:70)
>         at
> uk.me.parabola.mkgmap.main.Main.lambda$processFilename$1(Main.java:291)
>         at java.util.concurrent.FutureTask.run(FutureTask.java:266)
>         at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149
> )
>         at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624
> )
>         at java.lang.Thread.run(Thread.java:750)
> 
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