fix-adminbuilder-empty-inner-rings.patch


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--- a/src/mjolnir/adminbuilder.cc
+++ b/src/mjolnir/adminbuilder.cc
@@ -133,7 +133,8 @@
   for (const auto& inner : polygon.inners()) {
     inner_rings.push_back(geos_helper_t::from_striped_container(inner));
   }
-  auto* geos_poly = GEOSGeom_createPolygon(outer_ring, &inner_rings.front(), inner_rings.size());
+  auto* geos_poly = GEOSGeom_createPolygon(outer_ring,
+      inner_rings.empty() ? nullptr : &inner_rings.front(), inner_rings.size());
   auto* buffered = GEOSBuffer(geos_poly, 0, 8);
   GEOSNormalize(buffered);
   auto geom_type = GEOSGeomTypeId(buffered);