diff --git a/app/sessionStore.js b/app/sessionStore.js
index 9d026d084aa..d4d508677cc 100644
--- a/app/sessionStore.js
+++ b/app/sessionStore.js
@@ -90,11 +90,11 @@ module.exports.saveAppState = (immutablePayload, isShutdown) => {
 
     try {
       immutablePayload = module.exports.cleanAppData(immutablePayload, isShutdown)
-      immutablePayload.set('cleanedOnShutdown', isShutdown)
+      immutablePayload = immutablePayload.set('cleanedOnShutdown', isShutdown)
     } catch (e) {
-      immutablePayload.set('cleanedOnShutdown', false)
+      immutablePayload = immutablePayload.set('cleanedOnShutdown', false)
     }
-    immutablePayload.set('lastAppVersion', app.getVersion())
+    immutablePayload = immutablePayload.set('lastAppVersion', app.getVersion())
 
     if (isShutdown) {
       module.exports.cleanSessionDataOnShutdown()
@@ -173,7 +173,7 @@ module.exports.cleanPerWindowData = (immutablePerWindowData, isShutdown) => {
     // If a blob is present for the thumbnail, create the object URL
     if (immutableFrame.get('thumbnailBlob')) {
       try {
-        immutableFrame.set('thumbnailUrl', window.URL.createObjectURL(immutableFrame.get('thumbnailBlob')))
+        immutableFrame = immutableFrame.set('thumbnailUrl', window.URL.createObjectURL(immutableFrame.get('thumbnailBlob')))
       } catch (e) {
         immutableFrame = immutableFrame.delete('thumbnailUrl')
       }
@@ -252,7 +252,7 @@ module.exports.cleanPerWindowData = (immutablePerWindowData, isShutdown) => {
   }
   if (immutablePerWindowData.get('frames')) {
     // Don't restore pinned locations because they will be auto created by the app state change event
-    immutablePerWindowData.set('frames',
+    immutablePerWindowData = immutablePerWindowData.set('frames',
       immutablePerWindowData.get('frames')
         .filter((frame) => !frame.get('pinnedLocation')))
     immutablePerWindowData =
diff --git a/app/sessionStoreShutdown.js b/app/sessionStoreShutdown.js
index d70a7cc54fd..6643383fb2c 100644
--- a/app/sessionStoreShutdown.js
+++ b/app/sessionStoreShutdown.js
@@ -101,9 +101,9 @@ const saveAppState = (forceSave = false) => {
           // In this case on win32, the process doesn't try to auto restart, so avoid the user
           // having to open the app twice.  Maybe squirrel detects the app is already shutting down.
           if (platformUtil.isWindows()) {
-            immutableAppState.setIn(['updates', 'status'], updateStatus.UPDATE_APPLYING_RESTART)
+            immutableAppState = immutableAppState.setIn(['updates', 'status'], updateStatus.UPDATE_APPLYING_RESTART)
           } else {
-            immutableAppState.setIn(['updates', 'status'], updateStatus.UPDATE_APPLYING_NO_RESTART)
+            immutableAppState = immutableAppState.setIn(['updates', 'status'], updateStatus.UPDATE_APPLYING_NO_RESTART)
           }
         }
 
diff --git a/test/unit/app/sessionStoreTest.js b/test/unit/app/sessionStoreTest.js
index 9aeafa60d0b..3624aef47b6 100644
--- a/test/unit/app/sessionStoreTest.js
+++ b/test/unit/app/sessionStoreTest.js
@@ -122,32 +122,61 @@ describe('sessionStore unit tests', function () {
       cleanSessionDataOnShutdownStub.restore()
     })
 
-    it('calls cleanAppData', function () {
+    it('calls cleanAppData', function (cb) {
       cleanAppDataStub.reset()
       return sessionStore.saveAppState(Immutable.Map())
         .then(function (result) {
           assert.equal(cleanAppDataStub.calledOnce, true)
+          cb()
         }, function (err) {
           assert(!err)
         })
     })
 
     describe('with isShutdown', function () {
-      it('calls cleanSessionDataOnShutdown if true', function () {
+      before(function () {
+        this.writeImportantSpy = sinon.spy(muon.file, 'writeImportant')
+      })
+      after(function () {
+        this.writeImportantSpy.restore()
+      })
+      it('calls cleanSessionDataOnShutdown if true', function (cb) {
         cleanSessionDataOnShutdownStub.reset()
         return sessionStore.saveAppState(Immutable.Map(), true)
           .then(() => {
             assert.equal(cleanSessionDataOnShutdownStub.calledOnce, true)
+            cb()
           }, function (err) {
             assert(!err)
           })
       })
 
-      it('does not call cleanSessionDataOnShutdown if false', function () {
+      it('does not call cleanSessionDataOnShutdown if false', function (cb) {
         cleanSessionDataOnShutdownStub.reset()
         return sessionStore.saveAppState(Immutable.Map(), false)
           .then(() => {
             assert.equal(cleanSessionDataOnShutdownStub.notCalled, true)
+            cb()
+          }, function (err) {
+            assert(!err)
+          })
+      })
+
+      it('sets cleanedOnShutdown for saveAppState', function (cb) {
+        sessionStore.saveAppState(Immutable.Map(), true)
+          .then(() => {
+            assert.equal(JSON.parse(this.writeImportantSpy.getCall(0).args[1]).cleanedOnShutdown, true)
+            cb()
+          }, function (err) {
+            assert(!err)
+          })
+      })
+
+      it('sets lastAppVersion for saveAppState', function (cb) {
+        sessionStore.saveAppState(Immutable.Map(), true)
+          .then(() => {
+            assert.equal(JSON.parse(this.writeImportantSpy.getCall(0).args[1]).lastAppVersion, '0.14.0')
+            cb()
           }, function (err) {
             assert(!err)
           })
@@ -156,6 +185,26 @@ describe('sessionStore unit tests', function () {
   })
 
   describe('cleanPerWindowData', function () {
+    it('clears pinned frames', function () {
+      const data = Immutable.fromJS({frames: [
+        {
+          location: 'https://brave.com/cezar/master/ken/fight',
+          pinnedLocation: 'https://brave.com/cezar/master/ken/fight'
+        }, {
+          key: 1,
+          location: 'https://brave.com/cezar/monkey/fights/dragon',
+          src: 'https://brave.com/cezar/monkey/fights/dragon',
+          unloaded: true
+        }
+      ]})
+      const result = sessionStore.cleanPerWindowData(data, true)
+      assert.deepEqual(result.get('frames').toJS(), [{
+        key: 1,
+        location: 'https://brave.com/cezar/monkey/fights/dragon',
+        src: 'https://brave.com/cezar/monkey/fights/dragon',
+        unloaded: true
+      }])
+    })
   })
 
   describe('cleanAppData', function () {