https://github.com/NodeBB/NodeBB/issues/3588

Slide menu doesn't work on IE8. It doesn't really matter for IE8
desktop, because this was only on mobile resolutions anyways

lib/persona.js

@@ -159,6 +159,10 @@ $(document).ready(function() {
 	}
 
 	function setupMobileMenu() {
+		if (!window.addEventListener) {
+			return;
+		}
+
 		var slideout = new Slideout({
 			'panel': document.getElementById('panel'),
 			'menu': document.getElementById('menu'),