diff --git a/ui/src/lib/rects/rectangle.ts b/ui/src/lib/rects/rectangle.ts
index 3c7ec63..40f9b18 100644
--- a/ui/src/lib/rects/rectangle.ts
+++ b/ui/src/lib/rects/rectangle.ts
@@ -67,7 +67,7 @@ export class Rectangle {
   }
 
   public update(corner_1?: Vector2D, corner_2?: Vector2D): Rectangle {
-    return new Rectangle(corner_1 || this.corner_1, corner_2 || this.corner_2);
+    return new Rectangle(corner_1 ?? this.corner_1, corner_2 ?? this.corner_2);
   }
 
   public move(vector: Vector2D): Rectangle {
diff --git a/ui/src/lib/store.ts b/ui/src/lib/store.ts
index 6c9de5f..f1f09fe 100644
--- a/ui/src/lib/store.ts
+++ b/ui/src/lib/store.ts
@@ -57,7 +57,7 @@ export const advent22Store = defineStore({
         const favicon = await API.request<ImageData>("user/favicon");
 
         const link: HTMLLinkElement =
-          document.querySelector("link[rel*='icon']") ||
+          document.querySelector("link[rel*='icon']") ??
           document.createElement("link");
         link.rel = "shortcut icon";
         link.type = "image/x-icon";