Fix crash

Signal/src/Loki/View Controllers/LandingVC.swift

@@ -110,8 +110,10 @@ final class LandingVC : UIViewController, LinkDeviceVCDelegate, DeviceLinkingMod
     
     override func viewDidDisappear(_ animated: Bool) {
         super.viewDidAppear(animated)
+        if let fakeChatViewContentOffset = fakeChatViewContentOffset {
             fakeChatView.contentOffset = fakeChatViewContentOffset
         }
+    }
     
     // MARK: Interaction
     @objc private func register() {