Hide "Unimplemented type: 4" error

src/Tile.js

@@ -30,7 +30,18 @@ class Tile {
   }
 
   _loadTile(buffer) {
-    this.tile = new VectorTile(new Protobuf(buffer));
+    try {
+      this.tile = new VectorTile(new Protobuf(buffer));
+    } catch (error) {
+      // Ignoring upstream issue https://github.com/rastapasta/mapscii/issues/87
+      if (error.message === 'Unimplemented type: 4') {
+        this.tile = {
+          layers: [],
+        };
+        return;
+      }
+      throw error;
+    }
   }
 
   _unzipIfNeeded(buffer) {