convert: don't crash on empty mbtiles [#41]

protomaps · Sep 12, 2023 · 157c08d · 157c08d
1 parent 57b82de
commit 157c08d
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/pmtiles/convert.go b/pmtiles/convert.go
@@ -305,6 +305,10 @@ func ConvertMbtiles(logger *log.Logger, input string, output string, deduplicate
 		}
 	}
 
+	if tileset.GetCardinality() == 0 {
+		return fmt.Errorf("No tiles in MBTiles archive.")
+	}
+
 	logger.Println("Pass 2: writing tiles")
 	resolver := NewResolver(deduplicate, header.TileType == Mvt)
 	{