   }
 
   func toogleLike(_ post: FPPost, button: UIButton, label: UILabel) {
-    let postLike = ref.child("likes/\(post.postID)/\(uid!)")
+    let postLike = ref.child("likes/\(post.postID)/\(uid)")
     if post.isLiked {
       postLike.removeValue { error, _ in
         if let error = error {

        let alertController = MDCAlertController.init(title: "Report Post?", message: nil)
        let cancelAction = MDCAlertAction(title: "Cancel", handler: nil)
        let reportAction = MDCAlertAction(title: "Report") { _ in
          self.ref.child("postFlags/\(post.postID)/\(self.uid!)").setValue(true)
        }
        alertController.addAction(reportAction)
        alertController.addAction(cancelAction)

    super.viewDidAppear(animated)
    if let currentUser = Auth.auth().currentUser  {
      self.uid = currentUser.uid
      self.followingRef = ref.child("people/\(uid)/following")
    } else {
      let authViewController = FUIAuth.defaultAuthUI()?.authViewController()
      authViewController?.navigationBar.isHidden = true
