[mkgmap-dev] Internal Error Failed to render Multipolygon

Hello , I use mkgmap-4921 with patch from Ticker Berkin -Angelchecker-V6. With that i get inScandinavia following error : Internal Error Failed to render MultiPolygonRelation 1754729 and 304507. Rel. 1754729 is 'Ladoga'-sea with 5 226 Elements. Rel. 304507 is Multipolygon=water, 171 Elements. I assume the error ist not specific to the patch...and more common.. How to avoid this ? regards Thomas