diff --git a/js/gdm/util.js b/js/gdm/util.js
index 6876cbef9..decfa14a9 100644
--- a/js/gdm/util.js
+++ b/js/gdm/util.js
@@ -128,6 +128,9 @@ const ShellUserVerifier = new Lang.Class({
 
         this._client = client;
 
+        this._defaultService = null;
+        this._preemptingService = null;
+
         this._settings = new Gio.Settings({ schema_id: LOGIN_SCREEN_SCHEMA });
         this._settings.connect('changed',
                                Lang.bind(this, this._updateDefaultService));
@@ -140,6 +143,7 @@ const ShellUserVerifier = new Lang.Class({
         // at startup should result in immediately initiating authentication.
         // This is different than fingeprint readers, where we only check them
         // after a user has been picked.
+        this.smartcardDetected = false;
         this._checkForSmartcard();
 
         this._smartcardInsertedId = this._smartcardManager.connect('smartcard-inserted',
diff --git a/js/ui/appDisplay.js b/js/ui/appDisplay.js
index 7ebd968d8..3bad448fe 100644
--- a/js/ui/appDisplay.js
+++ b/js/ui/appDisplay.js
@@ -1083,6 +1083,8 @@ const AppSearchProvider = new Lang.Class({
     _init: function() {
         this._appSys = Shell.AppSystem.get_default();
         this.id = 'applications';
+        this.isRemoteProvider = false;
+        this.canLaunchSearch = false;
     },
 
     getResultMetas: function(apps, callback) {
@@ -1251,6 +1253,7 @@ const FolderIcon = new Lang.Class({
 
     _init: function(id, path, parentView) {
         this.id = id;
+        this.name = '';
         this._parentView = parentView;
 
         this._folder = new Gio.Settings({ schema_id: 'org.gnome.desktop.app-folders.folder',
diff --git a/js/ui/lookingGlass.js b/js/ui/lookingGlass.js
index c5bf28f59..89fef3c30 100644
--- a/js/ui/lookingGlass.js
+++ b/js/ui/lookingGlass.js
@@ -783,6 +783,7 @@ const LookingGlass = new Lang.Class({
 
         this._open = false;
 
+        this._it = null;
         this._offset = 0;
         this._results = [];
 
diff --git a/js/ui/messageList.js b/js/ui/messageList.js
index 8175711ba..99fd09fd9 100644
--- a/js/ui/messageList.js
+++ b/js/ui/messageList.js
@@ -165,6 +165,11 @@ const ScaleLayout = new Lang.Class({
     Name: 'ScaleLayout',
     Extends: Clutter.BinLayout,
 
+    _init: function(params) {
+        this._container = null;
+        this.parent(params);
+    },
+
     _connectContainer: function(container) {
         if (this._container == container)
             return;
@@ -299,6 +304,8 @@ const Message = new Lang.Class({
     _init: function(title, body) {
         this.expanded = false;
 
+        this._useBodyMarkup = false;
+
         this.actor = new St.Button({ style_class: 'message',
                                      accessible_role: Atk.Role.NOTIFICATION,
                                      can_focus: true,
diff --git a/js/ui/remoteSearch.js b/js/ui/remoteSearch.js
index 4f376bc31..dab2ad1d8 100644
--- a/js/ui/remoteSearch.js
+++ b/js/ui/remoteSearch.js
@@ -200,6 +200,7 @@ const RemoteSearchProvider = new Lang.Class({
         this.appInfo = appInfo;
         this.id = appInfo.get_id();
         this.isRemoteProvider = true;
+        this.canLaunchSearch = false;
     },
 
     createIcon: function(size, meta) {
diff --git a/js/ui/status/network.js b/js/ui/status/network.js
index e86e89fab..19c689b0c 100644
--- a/js/ui/status/network.js
+++ b/js/ui/status/network.js
@@ -1709,6 +1709,7 @@ const NMApplet = new Lang.Class({
 
         this._mainConnection = null;
         this._mainConnectionIconChangedId = 0;
+        this._mainConnectionStateChangedId = 0;
 
         this._notification = null;
 
diff --git a/js/ui/workspace.js b/js/ui/workspace.js
index 11a65d676..0f9220ad1 100644
--- a/js/ui/workspace.js
+++ b/js/ui/workspace.js
@@ -1100,6 +1100,7 @@ const Workspace = new Lang.Class({
     _init : function(metaWorkspace, monitorIndex) {
         // When dragging a window, we use this slot for reserve space.
         this._reservedSlot = null;
+        this._reservedSlotWindow = null;
         this.metaWorkspace = metaWorkspace;
 
         // The full geometry is the geometry we should try and position