diff --git a/static/js/menu.js b/static/js/menu.js
index 6c1f350..47b64e3 100644
--- a/static/js/menu.js
+++ b/static/js/menu.js
@@ -1,11 +1,15 @@
-var toggle = document.getElementById('toggle');
-var menu = document.getElementById('menu');
+const toggle = document.getElementById('toggle');
+const menu = document.getElementById('menu');
 
-toggle.addEventListener('click', function () {
+function toggleMenu() {
 	menu.classList.toggle('main-nav__list--active');
 	this.classList.toggle('main-nav__btn--active');
 	this.setAttribute(
 		'aria-expanded',
-		this.getAttribute('aria-expanded') === 'true' ? 'false' : 'true'
+		this.getAttribute('aria-expanded') === 'true' ? 'false' : 'true',
 	);
-});
+}
+
+if (toggle && menu) {
+	toggle.addEventListener('click', toggleMenu, false);
+}