diff --git a/js/state/frameStateUtil.js b/js/state/frameStateUtil.js
index b305b0762b3..c716b3aed04 100644
--- a/js/state/frameStateUtil.js
+++ b/js/state/frameStateUtil.js
@@ -308,7 +308,7 @@ function getFramePropsIndex (frames, frameProps) {
 function getFrameByLastAccessedTime (frames) {
   const frameProps = frames.toJS()
     .reduce((pre, cur) => {
-      return (cur.pinnedLocation === undefined &&
+      return ([undefined, null].includes(cur.pinnedLocation) &&
         cur.lastAccessedTime &&
         cur.lastAccessedTime > pre.lastAccessedTime
       ) ? cur : pre
@@ -768,5 +768,6 @@ module.exports = {
   frameStatePathForFrame,
   tabStatePath,
   tabStatePathForFrame,
-  getLastCommittedURL
+  getLastCommittedURL,
+  getFrameByLastAccessedTime
 }
diff --git a/test/unit/state/frameStateUtilTest.js b/test/unit/state/frameStateUtilTest.js
index 6ef666d78c3..dbc70f315c4 100644
--- a/test/unit/state/frameStateUtilTest.js
+++ b/test/unit/state/frameStateUtilTest.js
@@ -354,4 +354,42 @@ describe('frameStateUtil', function () {
       })
     })
   })
+
+  describe('getFrameByLastAccessedTime', function () {
+    let framesWithLastAccessedTime, framesWithoutLastAccessedTime, framesWithNullifiedLastAccessedTime
+
+    beforeEach(function () {
+      framesWithLastAccessedTime = Immutable.fromJS([
+        { key: 2, lastAccessedTime: null },
+        { key: 3, lastAccessedTime: 1488184050731 },
+        { key: 4, lastAccessedTime: 1488184050711 },
+        { key: 5 }
+      ])
+      framesWithoutLastAccessedTime = Immutable.fromJS([
+        { key: 2 },
+        { key: 3 },
+        { key: 4 }
+      ])
+      framesWithNullifiedLastAccessedTime = Immutable.fromJS([
+        { key: 2, lastAccessedTime: null },
+        { key: 3, lastAccessedTime: null },
+        { key: 4, lastAccessedTime: null }
+      ])
+    })
+
+    it('gets correct frame by last accessed time', function () {
+      const result = frameStateUtil.getFrameByLastAccessedTime(framesWithLastAccessedTime)
+      assert.equal(1, result)
+    })
+
+    it('returns -1 for frames without last accessed time', function () {
+      const result = frameStateUtil.getFrameByLastAccessedTime(framesWithoutLastAccessedTime)
+      assert.equal(-1, result)
+    })
+
+    it('returns -1 for frames with nullified last accessed time', function () {
+      const result = frameStateUtil.getFrameByLastAccessedTime(framesWithNullifiedLastAccessedTime)
+      assert.equal(-1, result)
+    })
+  })
 })