diff --git a/lib/core/nav/SideNav.js b/lib/core/nav/SideNav.js
index 57682c961897..221b19009f4c 100644
--- a/lib/core/nav/SideNav.js
+++ b/lib/core/nav/SideNav.js
@@ -127,6 +127,10 @@ class SideNav extends React.Component {
                 var toggler = document.querySelector(togglerSelector);
                 var target = document.querySelector(targetSelector);
 
+                if (!toggler) {
+                  return;
+                }
+
                 toggler.onclick = function(event) {
                   event.preventDefault();