diff --git a/src/App.js b/src/App.js
index f5b22393e..1529efbdd 100644
--- a/src/App.js
+++ b/src/App.js
@@ -23,7 +23,7 @@ const App = () => {
 
   useEffect(() => {
     const urlParams = new URLSearchParams(window.location.href.split('?')[1])
-    const theme = urlParams.get('theme') && urlParams.get('theme').match(/^[A-Za-z0-9\s]+/)[0]
+    const theme = urlParams.get('theme')?.match(/^[A-Za-z0-9\s]+/)?.[0]
     if (theme) {
       setColorMode(theme)
     }