From 1af5b9fce42649912f76ac56fe1374f63e4f67e9 Mon Sep 17 00:00:00 2001
From: Thomas Lauzi <tomek_29@gmx.de>
Date: Sun, 29 Mar 2020 23:21:22 +0200
Subject: [PATCH] FIX: NullReferenceException

---
 Core/Commands/DeleteOperatorsCommand.cs | 5 +++++
 Core/UndoRedoStack.cs                   | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Core/Commands/DeleteOperatorsCommand.cs b/Core/Commands/DeleteOperatorsCommand.cs
index 0900bf1..c5e2522 100644
--- a/Core/Commands/DeleteOperatorsCommand.cs
+++ b/Core/Commands/DeleteOperatorsCommand.cs
@@ -107,6 +107,11 @@ public void Undo()
 
         public void Do()
         {
+            if (_removeKeyframesCommand == null)
+            {
+                return;
+            }
+
             _removeKeyframesCommand.Do();
             
             var parent = MetaManager.Instance.GetMetaOperator(_parentMetaID);
diff --git a/Core/UndoRedoStack.cs b/Core/UndoRedoStack.cs
index 6785a26..f67ae09 100644
--- a/Core/UndoRedoStack.cs
+++ b/Core/UndoRedoStack.cs
@@ -297,7 +297,7 @@ public bool ProcessReceivedCommands()
 
         public void Add(ICommand command)
         {
-            if (command.IsUndoable)
+            if (command != null && command.IsUndoable)
             {
                 var jsonCommand = SerializeCommand(command);
 #if USE_COUCHDB