diff --git a/src/modals/SelectMapModal.js b/src/modals/SelectMapModal.js
index 3fb3353..6e988ac 100644
--- a/src/modals/SelectMapModal.js
+++ b/src/modals/SelectMapModal.js
@@ -127,7 +127,7 @@ function SelectMapModal({
     return new Promise((resolve, reject) => {
       image.onload = async function () {
         // Find name and grid size
-        let gridSize;
+        let gridSize = { x: 22, y: 22 };
         let name = "Unknown Map";
         if (file.name) {
           if (file.name.matchAll) {