From 1b561fc54f107df583281667eb92e7975ec33ba8 Mon Sep 17 00:00:00 2001
From: Gary Hemstock <gary_hemstock@cooperators.ca>
Date: Wed, 26 Sep 2018 13:07:52 -0400
Subject: [PATCH] [fixed] if tabbable element is undefined, focus head or tail
 based on shiftKey

---
 src/helpers/scopeTab.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/helpers/scopeTab.js b/src/helpers/scopeTab.js
index b8516c4d..16513c19 100644
--- a/src/helpers/scopeTab.js
+++ b/src/helpers/scopeTab.js
@@ -63,8 +63,13 @@ export default function scopeTab(node, event) {
   }
 
   // If the tabbable element does not exist,
-  // let the browser control the focus
-  if (typeof tabbable[x] === "undefined") return;
+  // focus head/tail based on shiftKey
+  if (typeof tabbable[x] === "undefined") {
+    event.preventDefault();
+    target = shiftKey ? tail : head;
+    target.focus();
+    return;
+  }
 
   event.preventDefault();