diff --git a/public/assets/tileset.js b/public/assets/sprite.js
similarity index 91%
rename from public/assets/tileset.js
rename to public/assets/sprite.js
index 7803b40..56a6a54 100755
--- a/public/assets/tileset.js
+++ b/public/assets/sprite.js
@@ -6,8 +6,8 @@ import {basename, dirname, extname, join} from 'node:path';
 import imageSize from 'image-size';
 
 const tileset = process.argv[2];
-let w = parseInt(process.argv[3]);
-let h = parseInt(process.argv[4]);
+let w = parseInt(process.argv[3] || '0');
+let h = parseInt(process.argv[4] || '0');
 
 const {width, height} = imageSize(tileset);