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Using Lua, if you read the cursor_ghost field of a character entity, assigning that value to another character entity's cursor_ghost field crashes the game. No item actually needs to be in the cursor ghost, nor does the character need to be currently controlled by a player (the game will also crash if there is an item).
To reproduce:

1. Create a new world (ctrl+shift+click New Game)
2. Run the following commands:

   Code: Select all

   -- create a new player (run twice so it actually happens)
   /c character = game.player.surface.create_entity{name="character", position={0,2}}
   
   -- read the value of your player's cursor_ghost field
   /c ghost = game.player.character.cursor_ghost
   
   -- assign the cursor_ghost value to another character's cursor_ghost field
   /c character.cursor_ghost = ghost
   

3. The game crashes (not a Lua error)

The expected result would be that the contents of the ghost cursor are copied correctly, but if I'm reading the docs wrong a Lua error related to assigning the wrong kind of value would also make sense.

The crash log is attached; at first glance it appears to be a null pointer dereference in GameStateAdapter::setGhostCursor.

Thanks, the issue is fixed for the next release.