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: