diff --git a/index.html b/index.html
index e719c1bf3..616f731ea 100644
--- a/index.html
+++ b/index.html
@@ -7925,7 +7925,7 @@
     <script src="utils/commonUtils.js?v=1.89.29"></script>
     <script src="utils/arrayUtils.js"></script>
     <script src="utils/colorUtils.js"></script>
-    <script src="utils/graphUtils.js?v=1.88.02"></script>
+    <script src="utils/graphUtils.js?v=1.90.01"></script>
     <script src="utils/nodeUtils.js"></script>
     <script src="utils/numberUtils.js?v=1.89.08"></script>
     <script src="utils/polyfills.js"></script>
diff --git a/utils/graphUtils.js b/utils/graphUtils.js
index c6315088b..780dc9317 100644
--- a/utils/graphUtils.js
+++ b/utils/graphUtils.js
@@ -137,6 +137,7 @@ function find(x, y, radius = Infinity) {
 
 // return closest cell index
 function findCell(x, y, radius = Infinity) {
+  if (!pack.cells?.q) return;
   const found = pack.cells.q.find(x, y, radius);
   return found ? found[2] : undefined;
 }
diff --git a/versioning.js b/versioning.js
index 77a1bcda7..904f4d496 100644
--- a/versioning.js
+++ b/versioning.js
@@ -1,7 +1,7 @@
 "use strict";
 
 // version and caching control
-const version = "1.90.00"; // generator version, update each time
+const version = "1.90.01"; // generator version, update each time
 
 {
   document.title += " v" + version;