--- a/browser/base/content/browser-loop.js
+++ b/browser/base/content/browser-loop.js
@@ -69,16 +69,19 @@ XPCOMUtils.defineLazyModuleGetter(this, 
      * @param {string} [aReason] Some states are only shown if
      *                           a related reason is provided.
      *
      *                 aReason="login": Used after a login is completed
      *                   successfully. This is used so the state can be
      *                   temporarily shown until the next state change.
      */
     updateToolbarState: function(aReason = null) {
+      if (!this.toolbarButton.node) {
+        return;
+      }
       let state = "";
       if (MozLoopService.errors.size) {
         state = "error";
       } else if (aReason == "login" && MozLoopService.userProfile) {
         state = "active";
       } else if (MozLoopService.doNotDisturb) {
         state = "disabled";
       }