diff --git a/public/toggle-theme.js b/public/toggle-theme.js
index 7baaa00..23ad32e 100644
--- a/public/toggle-theme.js
+++ b/public/toggle-theme.js
@@ -37,7 +37,7 @@ window.onload = () => {
   reflectPreference();
 
   // now this script can find and listen for clicks on the control
-  document.querySelector("#theme-btn").addEventListener("click", () => {
+  document.querySelector("#theme-btn")?.addEventListener("click", () => {
     themeValue = themeValue === "light" ? "dark" : "light";
     setPreference();
   });