From 15561c8d6903b9d4a7111fe397c1132211ae075d Mon Sep 17 00:00:00 2001
From: gszo123 <gszo123@gmail.com>
Date: Sun, 29 May 2016 17:55:59 +0200
Subject: [PATCH] Fix file saving crash due to invald buffer

While trying to save a untitled empty document, user could open a existing
file that erases the untitled document's buffer, then save action make
Notepad++ crash:
https://www.youtube.com/watch?v=balHtvy4Toc
Fixes #1857, Closes #1904
---
 PowerEditor/src/NppIO.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/PowerEditor/src/NppIO.cpp b/PowerEditor/src/NppIO.cpp
index 7a5cc005..8feb0362 100644
--- a/PowerEditor/src/NppIO.cpp
+++ b/PowerEditor/src/NppIO.cpp
@@ -453,6 +453,18 @@ bool Notepad_plus::doReload(BufferID id, bool alert)
 
 bool Notepad_plus::doSave(BufferID id, const TCHAR * filename, bool isCopy)
 {
+	const int index = MainFileManager->getBufferIndexByID(id);
+	if (index == -1)
+	{
+		_nativeLangSpeaker.messageBox("BufferInvalidWarning",
+			_pPublicInterface->getHSelf(),
+			TEXT("Cannot save: Buffer is invalid."),
+			TEXT("Save failed"),
+			MB_OK | MB_ICONWARNING);
+
+		return false;
+	}
+
 	SCNotification scnN;
 	// Notify plugins that current file is about to be saved
 	if (!isCopy)