diff --git a/index.html b/index.html
index c997c028..c1c6364d 100644
--- a/index.html
+++ b/index.html
@@ -8110,7 +8110,7 @@
     <script src="modules/ui/stylePresets.js?v=1.96.00"></script>
 
     <script src="modules/ui/general.js?v=1.98.01"></script>
-    <script src="modules/ui/options.js?v=1.98.02"></script>
+    <script src="modules/ui/options.js?v=1.98.03"></script>
     <script src="main.js?v=1.98.01"></script>
 
     <script defer src="modules/relief-icons.js"></script>
diff --git a/modules/ui/options.js b/modules/ui/options.js
index 331a7476..62ae30d5 100644
--- a/modules/ui/options.js
+++ b/modules/ui/options.js
@@ -902,9 +902,9 @@ function updateTilesOptions() {
   }
 
   const tileSize = byId("tileSize");
-  const tilesX = +byId("tileColsOutput").value;
-  const tilesY = +byId("tileRowsOutput").value;
-  const scale = +byId("tileScaleOutput").value;
+  const tilesX = +byId("tileColsOutput").value || 2;
+  const tilesY = +byId("tileRowsOutput").value || 2;
+  const scale = +byId("tileScaleOutput").value || 1;
 
   // calculate size
   const sizeX = graphWidth * scale * tilesX;
diff --git a/versioning.js b/versioning.js
index 0e5b2030..79b475dd 100644
--- a/versioning.js
+++ b/versioning.js
@@ -1,7 +1,7 @@
 "use strict";
 
 // version and caching control
-const version = "1.98.02"; // generator version, update each time
+const version = "1.98.03"; // generator version, update each time
 
 {
   document.title += " v" + version;