Game crashed when triying to put a giant Skull in a lake

As the title sugest, if you try to create in a lake a giant skull and then try to move it, the game crashes. It's important to say that, before the bug i was triying to put a large number of little skulls, delete them and then create the giant skull. Probably the water effect + the skulls it's the problem? Thanks for the tool, it's awesome ^^