Fix crash which could occur when reloading NewGRFs on main menu

src/openttd.cpp

@@ -2061,7 +2061,9 @@ void StateGameLoop()
 		BasePersistentStorageArray::SwitchMode(PSM_ENTER_GAMELOOP);
 		_tick_skip_counter++;
 		_scaled_tick_counter++;
-		_scaled_date_ticks++;   // This must update in lock-step with _tick_skip_counter, such that it always matches what SetScaledTickVariables would return.
+		if (_game_mode != GM_MENU && _game_mode != GM_BOOTSTRAP) {
+			_scaled_date_ticks++;   // This must update in lock-step with _tick_skip_counter, such that it always matches what SetScaledTickVariables would return.
+		}
 
 		if (_settings_client.gui.autosave == 6 && !(_game_mode == GM_MENU || _game_mode == GM_BOOTSTRAP) &&
 				(_scaled_date_ticks % (_settings_client.gui.autosave_custom_minutes * (_settings_game.economy.tick_rate == TRM_MODERN ? (60000 / 27) : (60000 / 30)))) == 0) {