Found the error in the format functor

I shouldn't automatically guess where an error is, since this project is
so complex.

common/map/map_file_format.cpp

@@ -33,7 +33,8 @@ void DummyFormat::Save(Region* const ptr) {
 
 void LuaFormat::Load(Region** const ptr, int x, int y) {
 	//something to load into
-	if (!ptr) {
+
+	if (!(*ptr)) {
 		(*ptr) = new Region(x, y);
 	}