diff --git a/components/windowsize.tsx b/components/windowsize.tsx
index 27cb575..063fae5 100644
--- a/components/windowsize.tsx
+++ b/components/windowsize.tsx
@@ -1,9 +1,14 @@
 import { useEffect, useState } from "react";
 
-export default function useWindowSize() {
-  const [windowSize, setWindowSize] = useState({
-    width: 0,
-    height: 0,
+interface ScreenSize {
+  width: number | undefined;
+  height: number | undefined;
+}
+
+export default function useWindowSize(): boolean | undefined {
+  const [windowSize, setWindowSize] = useState<ScreenSize>({
+    width: undefined,
+    height: undefined,
   });
 
   useEffect(() => {
@@ -20,5 +25,10 @@ export default function useWindowSize() {
 
     return () => window.removeEventListener("resize", handleResize);
   }, []);
-  return windowSize.width <= 1080;
+  if(typeof(windowSize.width) === "number") {
+    return windowSize.width <= 1080;
+  }
+  else {
+    return undefined;
+  }
 }
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