If a module or addon errors out on the loading screen it will jump into a...

If a module or addon errors out on the loading screen it will jump into a "safe mode" to display the error message and then go back to the main menu

game/engines/default/engine/BootErrorHandler.lua

+-- TE4 - T-Engine 4
+-- Copyright (C) 2009 - 2015 Nicolas Casalini
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation, either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program.  If not, see <http://www.gnu.org/licenses/>.
+--
+-- Nicolas Casalini "DarkGod"
+-- darkgod@te4.org
+
+require "engine.class"
+local UIBase = require "engine.ui.Base"
+local Game = require "engine.Game"
+local KeyBind = require "engine.KeyBind"
+
+--- Handles dialog windows
+-- @classmod engine.Module
+module(..., package.seeall, class.inherit(Game))
+
+function _M:init(errs, mod)
+	-- I like to fak'it fak'it !
+	self.__mod_info = mod
+	_G.game = self
+
+	-- Force load definitions of UI to be able to display the error
+	for _, file in ipairs(fs.list("/data/gfx/ui/definitions")) do
+		if file:find("%.lua$") then UIBase:loadUIDefinitions("/data/gfx/ui/definitions/"..file) end
+	end
+
+	Game.init(self, KeyBind.new())
+
+	self:loaded()
+
+	local d = require("engine.dialogs.ShowErrorStack").new(errs)
+	d.unload = function(self)
+		util.showMainMenu()
+	end
+	self:registerDialog(d)	
+end

game/engines/default/engine/Module.lua

-
 -- TE4 - T-Engine 4
 -- Copyright (C) 2009 - 2015 Nicolas Casalini
 --
@@ -839,6 +838,14 @@ function _M:loadScreen(mod)
 
 			if tip then tip(dw / 2, dy) end
 			if funfacts then funfacts(sw, 10) end
+			
+			local errs = core.game.checkError()
+			if errs then
+				local errgame = require("engine.BootErrorHandler").new(errs, mod)
+				_G.game = errgame
+				errgame:setCurrent()
+				core.wait.disable()
+			end
 		end
 	end)
 	core.display.forceRedraw()