diff --git a/PowerEditor/src/Notepad_plus.cpp b/PowerEditor/src/Notepad_plus.cpp
index e7c7e05cc..65320ed62 100644
--- a/PowerEditor/src/Notepad_plus.cpp
+++ b/PowerEditor/src/Notepad_plus.cpp
@@ -3949,7 +3949,12 @@ void Notepad_plus::drawTabbarColoursFromStylerArray()
 		TabBarPlus::setColour(stInact->_bgColor, TabBarPlus::inactiveBg);
 }
 
-void Notepad_plus::notifyBufferChanged(Buffer * buffer, int mask) {
+void Notepad_plus::notifyBufferChanged(Buffer * buffer, int mask) 
+{
+	// To avoid to crash while MS-DOS style is set as default language,
+	// Checking the validity of current instance is necessary.
+	if (!this) return;
+
 	NppParameters *pNppParam = NppParameters::getInstance();
 	const NppGUI & nppGUI = pNppParam->getNppGUI();
 
diff --git a/PowerEditor/src/Notepad_plus.rc b/PowerEditor/src/Notepad_plus.rc
index d1f2fd4f7..4067df18c 100644
--- a/PowerEditor/src/Notepad_plus.rc
+++ b/PowerEditor/src/Notepad_plus.rc
@@ -185,7 +185,7 @@ BEGIN
         MENUITEM "Sav&e All",                        IDM_FILE_SAVEALL
         MENUITEM "Rename...",                        IDM_FILE_RENAME
         MENUITEM "&Close",                           IDM_FILE_CLOSE
-        MENUITEM "Cl&ose All",                       IDM_FILE_CLOSEALL
+        MENUITEM "Clos&e All",                       IDM_FILE_CLOSEALL
         MENUITEM "Close All but Active Document",    IDM_FILE_CLOSEALL_BUT_CURRENT
         MENUITEM "Delete from Disk",                 IDM_FILE_DELETE
         MENUITEM SEPARATOR
diff --git a/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp b/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
index afd2a1c9b..06fbd6393 100644
--- a/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
+++ b/PowerEditor/src/ScitillaComponent/ScintillaEditView.cpp
@@ -1501,7 +1501,8 @@ void ScintillaEditView::activateBuffer(BufferID buffer)
     return;	//all done
 }
 
-void ScintillaEditView::bufferUpdated(Buffer * buffer, int mask) {
+void ScintillaEditView::bufferUpdated(Buffer * buffer, int mask)
+{
 	//actually only care about language and lexing etc
 	if (buffer == _currentBuffer) 
 	{