Cloned/new map objects return empty value

When I create or clone a map (item) object inside a class called on PlayerInteractEvent, it comes out empty with this error:

Code:

Warning: Creating default object from empty value in C:\Users\*****\Downloads\PocketMine-MP\plugins\MapImage\src\MapImage\Renderer\ImageRenderer.php on line 41

This is line 41:

PHP:

$map = Item::get(Item::MAP, 0, 1);

I know that maps are not yet implemented or registered into the item list, and even though I tried registering a "fake" map class into the item list, the same error occurs everytime.

 

Of course, it is defined as id 395, when I use "/give <name> 395" I get an empty map. I'm using PocketMine 1.6.2dev or something like that.