From d224d57cf2e4d677b673b317b3cc83d83f51d1c6 Mon Sep 17 00:00:00 2001
From: Ellpeck <megamaximal@gmail.com>
Date: Sun, 1 Dec 2019 22:58:20 +0100
Subject: [PATCH] added a handler for this

---
 MLEM/Extensions/GraphicsExtensions.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/MLEM/Extensions/GraphicsExtensions.cs b/MLEM/Extensions/GraphicsExtensions.cs
index df5faa1..a84e01a 100644
--- a/MLEM/Extensions/GraphicsExtensions.cs
+++ b/MLEM/Extensions/GraphicsExtensions.cs
@@ -1,3 +1,4 @@
+using System;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
 
@@ -17,6 +18,9 @@ namespace MLEM.Extensions {
                 manager.PreferredBackBufferWidth = curr.Width;
                 manager.PreferredBackBufferHeight = curr.Height;
             } else {
+                if (lastWidth <= 0 || lastHeight <= 0)
+                    throw new InvalidOperationException("Can't call SetFullscreen to change out of fullscreen mode without going into fullscreen mode first");
+
                 manager.PreferredBackBufferWidth = lastWidth;
                 manager.PreferredBackBufferHeight = lastHeight;
             }