Fixed breaking change to loading the TabsController.

CHANGELOG.md

+## 2.12.9
+
+* Fixed breaking change to loading the TabsController.
+
 ## 2.12.8
 
 * [issue-933](https://github.com/CosmicMind/Material/issues/933): Fixed issue where `NavigationDrawerController` was not displaying the `leftViewController` and `rightViewController`.

Material.podspec

 Pod::Spec.new do |s|
 	s.name = 'Material'
-	s.version = '2.12.8'
+	s.version = '2.12.9'
 	s.license = 'BSD-3-Clause'
 	s.summary = 'A UI/UX framework for creating beautiful applications.'
 	s.homepage = 'http://materialswift.com'

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>2.12.8</string>
+	<string>2.12.9</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

Sources/iOS/TransitionController.swift

@@ -190,7 +190,12 @@ open class TransitionController: UIViewController {
         view.contentScaleFactor = Screen.scale
         
         prepareContainer()
-        prepare(viewController: rootViewController, in: container)
+        
+        guard let v = rootViewController else {
+            return
+        }
+        
+        prepare(viewController: v, in: container)
     }
 }