diff --git a/MCServer/Plugins/Debuggers/Debuggers.lua b/MCServer/Plugins/Debuggers/Debuggers.lua
index a9e834361..1d441d8fb 100644
--- a/MCServer/Plugins/Debuggers/Debuggers.lua
+++ b/MCServer/Plugins/Debuggers/Debuggers.lua
@@ -582,10 +582,10 @@ function HandleTestWndCmd(a_Split, a_Player)
 	
 	-- Test out the OnClosing callback's ability to refuse to close the window
 	local attempt = 1;
-	local OnClosing = function(Window, Player)
-		Player:SendMessage("Window closing attempt #" .. attempt);
+	local OnClosing = function(Window, Player, CanRefuse)
+		Player:SendMessage("Window closing attempt #" .. attempt .. "; CanRefuse = " .. tostring(CanRefuse));
 		attempt = attempt + 1;
-		return (attempt <= 3);  -- refuse twice, then allow
+		return CanRefuse and (attempt <= 3);  -- refuse twice, then allow, unless CanRefuse is set to true
 	end
 	
 	-- Log the slot changes
diff --git a/source/LuaWindow.cpp b/source/LuaWindow.cpp
index f6277250c..13d06eeb6 100644
--- a/source/LuaWindow.cpp
+++ b/source/LuaWindow.cpp
@@ -117,20 +117,20 @@ void cLuaWindow::SetOnSlotChanged(cPlugin_NewLua * a_Plugin, int a_FnRef)
 
 
 
-bool cLuaWindow::ClosedByPlayer(cPlayer & a_Player)
+bool cLuaWindow::ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse)
 {
 	// First notify the plugin through the registered callback:
 	if (m_OnClosingFnRef != LUA_REFNIL)
 	{
 		ASSERT(m_Plugin != NULL);
-		if (m_Plugin->CallbackWindowClosing(m_OnClosingFnRef, *this, a_Player))
+		if (m_Plugin->CallbackWindowClosing(m_OnClosingFnRef, *this, a_Player, a_CanRefuse))
 		{
-			// The callback disagrees
+			// The callback disagrees (the higher levels check the CanRefuse flag compliance)
 			return false;
 		}
 	}
 	
-	return super::ClosedByPlayer(a_Player);
+	return super::ClosedByPlayer(a_Player, a_CanRefuse);
 }
 
 
diff --git a/source/LuaWindow.h b/source/LuaWindow.h
index dc4497df7..de24170df 100644
--- a/source/LuaWindow.h
+++ b/source/LuaWindow.h
@@ -83,7 +83,7 @@ protected:
 	int m_OnSlotChangedFnRef;
 	
 	// cWindow overrides:
-	virtual bool ClosedByPlayer(cPlayer & a_Player) override;
+	virtual bool ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse) override;
 	virtual void Destroy(void) override;
 	
 	// cItemGrid::cListener overrides:
diff --git a/source/Player.cpp b/source/Player.cpp
index 519837f6a..dd71ca834 100644
--- a/source/Player.cpp
+++ b/source/Player.cpp
@@ -128,7 +128,7 @@ void cPlayer::Initialize( cWorld* a_World )
 
 void cPlayer::Destroyed()
 {
-	CloseWindow();
+	CloseWindow(false);
 	m_ClientHandle = NULL;
 }
 
@@ -437,7 +437,7 @@ void cPlayer::OpenWindow(cWindow * a_Window)
 {
 	if (a_Window != m_CurrentWindow)
 	{
-		CloseWindow();
+		CloseWindow(false);
 	}
 	a_Window->OpenedByPlayer(*this);
 	m_CurrentWindow = a_Window;
@@ -448,7 +448,7 @@ void cPlayer::OpenWindow(cWindow * a_Window)
 
 
 
-void cPlayer::CloseWindow(void)
+void cPlayer::CloseWindow(bool a_CanRefuse)
 {
 	if (m_CurrentWindow == NULL)
 	{
@@ -456,7 +456,7 @@ void cPlayer::CloseWindow(void)
 		return;
 	}
 	
-	if (m_CurrentWindow->ClosedByPlayer(*this))
+	if (m_CurrentWindow->ClosedByPlayer(*this, a_CanRefuse) || !a_CanRefuse)
 	{
 		// Close accepted, go back to inventory window (the default):
 		m_CurrentWindow = m_InventoryWindow;
@@ -473,7 +473,7 @@ void cPlayer::CloseWindow(void)
 
 
 
-void cPlayer::CloseWindowIfID(char a_WindowID)
+void cPlayer::CloseWindowIfID(char a_WindowID, bool a_CanRefuse)
 {
 	if ((m_CurrentWindow == NULL) || (m_CurrentWindow->GetWindowID() != a_WindowID))
 	{
diff --git a/source/Player.h b/source/Player.h
index 5617b9785..c582c1802 100644
--- a/source/Player.h
+++ b/source/Player.h
@@ -93,11 +93,11 @@ public:
 	
 	// tolua_begin
 	
-	/// Closes the current window, resets current window to m_InventoryWindow
-	void CloseWindow(void);
+	/// Closes the current window, resets current window to m_InventoryWindow. A plugin may refuse the closing if a_CanRefuse is true
+	void CloseWindow(bool a_CanRefuse = true);
 	
 	/// Closes the current window if it matches the specified ID, resets current window to m_InventoryWindow
-	void CloseWindowIfID(char a_WindowID);
+	void CloseWindowIfID(char a_WindowID, bool a_CanRefuse = true);
 
 	cClientHandle * GetClientHandle(void) const { return m_ClientHandle; }
 
diff --git a/source/Plugin_NewLua.cpp b/source/Plugin_NewLua.cpp
index a76b51806..885184c12 100644
--- a/source/Plugin_NewLua.cpp
+++ b/source/Plugin_NewLua.cpp
@@ -1665,7 +1665,7 @@ void cPlugin_NewLua::Unreference(int a_LuaRef)
 
 
 
-bool cPlugin_NewLua::CallbackWindowClosing(int a_FnRef, cWindow & a_Window, cPlayer & a_Player)
+bool cPlugin_NewLua::CallbackWindowClosing(int a_FnRef, cWindow & a_Window, cPlayer & a_Player, bool a_CanRefuse)
 {
 	ASSERT(a_FnRef != LUA_REFNIL);
 	
@@ -1673,9 +1673,10 @@ bool cPlugin_NewLua::CallbackWindowClosing(int a_FnRef, cWindow & a_Window, cPla
 	lua_rawgeti(m_LuaState, LUA_REGISTRYINDEX, a_FnRef);  // Push the function to be called
 	tolua_pushusertype(m_LuaState, &a_Window, "cWindow");
 	tolua_pushusertype(m_LuaState, &a_Player, "cPlayer");
+	tolua_pushboolean (m_LuaState, a_CanRefuse ? 1 : 0);
 
 	// Call function:
-	int s = lua_pcall(m_LuaState, 2, 1, 0);
+	int s = lua_pcall(m_LuaState, 3, 1, 0);
 	if (report_errors(m_LuaState, s))
 	{
 		LOGERROR("LUA error in %s. Stack size: %i", __FUNCTION__, lua_gettop(m_LuaState));
diff --git a/source/Plugin_NewLua.h b/source/Plugin_NewLua.h
index 34ab85ca4..de6077a55 100644
--- a/source/Plugin_NewLua.h
+++ b/source/Plugin_NewLua.h
@@ -106,7 +106,7 @@ public:
 	void Unreference(int a_LuaRef);
 	
 	/// Calls the plugin-specified "cLuaWindow closing" callback. Returns true only if the callback returned true
-	bool CallbackWindowClosing(int a_FnRef, cWindow & a_Window, cPlayer & a_Player);
+	bool CallbackWindowClosing(int a_FnRef, cWindow & a_Window, cPlayer & a_Player, bool a_CanRefuse);
 	
 	/// Calls the plugin-specified "cLuaWindow slot changed" callback.
 	void CallbackWindowSlotChanged(int a_FnRef, cWindow & a_Window, int a_SlotNum);
diff --git a/source/UI/Window.cpp b/source/UI/Window.cpp
index f353d0721..3c28f33b0 100644
--- a/source/UI/Window.cpp
+++ b/source/UI/Window.cpp
@@ -251,7 +251,7 @@ void cWindow::OpenedByPlayer(cPlayer & a_Player)
 
 
 
-bool cWindow::ClosedByPlayer(cPlayer & a_Player)
+bool cWindow::ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse)
 {
 	// Checks whether the player is still holding an item
 	if (a_Player.IsDraggingItem())
diff --git a/source/UI/Window.h b/source/UI/Window.h
index 68774aa59..0ff87dc70 100644
--- a/source/UI/Window.h
+++ b/source/UI/Window.h
@@ -108,7 +108,7 @@ public:
 	void OpenedByPlayer(cPlayer & a_Player);
 	
 	/// Called when a player closes this window; notifies all slot areas. Returns true if close accepted
-	virtual bool ClosedByPlayer(cPlayer & a_Player);
+	virtual bool ClosedByPlayer(cPlayer & a_Player, bool a_CanRefuse);
 
 	void SendWholeWindow(cClientHandle & a_Client);
 	void BroadcastWholeWindow(void);