Can you post the WKB of one of the failing geometries, from the loaded data? It's best to look at the exact input causing the problem.
On a side note, I did notice that when the polygons were merged (using JTS, which works fine), there is only one very small hole in the result [1]. It seems to correspond to an island in the Duff River [2]. It seems unlikely that this is the source of the error, but maybe... It seems like a data anomaly, anyway. [1] POLYGON ((-8.3812533 54.4642992, -8.3813736 54.4644802, -8.3817665 54.4646982, -8.3821098 54.464834, -8.382223 54.4648443, -8.3824884 54.4647987, -8.3820746 54.4646188, -8.3817225 54.4644208, -8.3814844 54.4643394, -8.3812533 54.4642992)) [2] https://www.openstreetmap.org/#map=17/54.46483/-8.38280&layers=C On Mon, Jan 21, 2019 at 1:00 PM Simon Greener <si...@spatialdbadvisor.com> wrote: > The shapefile (from OSM) can be accessed here: > > https://www.dropbox.com/s/jbptp3ycmc8cqzi/gis_osm_county_a_free_1.rar?dl=0 > > >
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