From 1efc91cb945e1cfdfa65812d2ddc52d8b7da49d1 Mon Sep 17 00:00:00 2001
From: zeromus <zeromus@users.noreply.github.com>
Date: Thu, 18 Jun 2020 03:07:44 -0400
Subject: [PATCH] hex editor: handle tiny (even 0 size) memory domains without
 crashing

---
 src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs b/src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
index 88617a1dc9..90bd2cc832 100644
--- a/src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/HexEditor/HexEditor.cs
@@ -554,10 +554,13 @@ namespace BizHawk.Client.EmuHawk
 			end = Math.Min(end, _domain.Size);
 			end &= -(long)dataSize;
 
-			var range = new MutableRange<long>(start, end - 1);
-
 			var dict = new Dictionary<long, long>();
 
+			if (end <= start)
+				return dict;
+
+			var range = new MutableRange<long>(start, end - 1);
+
 			switch (dataSize)
 			{
 				default: