From 45f833ceea17628cc54856bb9aa58916e0dc6589 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 25 Sep 2019 22:14:42 +0900
Subject: [PATCH] Add invocation null checks for safety

---
 osu.Game/Graphics/UserInterface/BackButton.cs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/osu.Game/Graphics/UserInterface/BackButton.cs b/osu.Game/Graphics/UserInterface/BackButton.cs
index 5fa634425b..62c33b9a39 100644
--- a/osu.Game/Graphics/UserInterface/BackButton.cs
+++ b/osu.Game/Graphics/UserInterface/BackButton.cs
@@ -18,7 +18,7 @@ namespace osu.Game.Graphics.UserInterface
 
         public BackButton(Receptor receptor)
         {
-            receptor.OnBackPressed = () => Action.Invoke();
+            receptor.OnBackPressed = () => Action?.Invoke();
 
             Size = TwoLayerButton.SIZE_EXTENDED;
 
@@ -60,7 +60,7 @@ namespace osu.Game.Graphics.UserInterface
                 switch (action)
                 {
                     case GlobalAction.Back:
-                        OnBackPressed.Invoke();
+                        OnBackPressed?.Invoke();
                         return true;
                 }