From e7a023edced99e3ae59712c231d9309b671c905b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Mail=C3=A4nder?= <matthias@mailaender.name>
Date: Sat, 6 Jun 2015 11:12:37 +0200
Subject: [PATCH] catch an explicit null dereference

---
 OpenRA.Game/FileFormats/PngLoader.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/OpenRA.Game/FileFormats/PngLoader.cs b/OpenRA.Game/FileFormats/PngLoader.cs
index 3652b3b428..e3c9cc45e1 100644
--- a/OpenRA.Game/FileFormats/PngLoader.cs
+++ b/OpenRA.Game/FileFormats/PngLoader.cs
@@ -99,6 +99,9 @@ namespace OpenRA.FileFormats
 
 							case "IEND":
 								{
+									if (bitmap == null)
+										throw new InvalidDataException("Image header not found.");
+
 									var bits = bitmap.LockBits(bitmap.Bounds(),
 										ImageLockMode.WriteOnly, PixelFormat.Format8bppIndexed);