From 13aa01ff99f49285139c4a2fbf962a5731d3857a Mon Sep 17 00:00:00 2001
From: ReignOfComputer <roc@reignofcomputer.com>
Date: Thu, 9 Mar 2017 15:31:22 +0800
Subject: [PATCH] Check for Null Event Constant Difference before Clipboard
 Export (#930)

Prevents ArgumentNullException.
---
 PKHeX.WinForms/Subforms/Save Editors/SAV_EventFlags.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/PKHeX.WinForms/Subforms/Save Editors/SAV_EventFlags.cs b/PKHeX.WinForms/Subforms/Save Editors/SAV_EventFlags.cs
index 3617bb52a..2c158c6ea 100644
--- a/PKHeX.WinForms/Subforms/Save Editors/SAV_EventFlags.cs	
+++ b/PKHeX.WinForms/Subforms/Save Editors/SAV_EventFlags.cs	
@@ -424,6 +424,12 @@ private void diffSaves()
                 Console.Write(e);
             }
 
+            if (string.IsNullOrEmpty(r))
+            {
+                WinFormsUtil.Alert("No Event Constant diff found.");
+                return;
+            }
+
             if (DialogResult.Yes != WinFormsUtil.Prompt(MessageBoxButtons.YesNo, "Copy Event Constant diff to clipboard?"))
                 return;
             Clipboard.SetText(r);