[0.12.8][posila] Game crashes when fast replacing a beacon

[Bunny]

Game crashes when fast replacing a beacon that has no modules in it.

Mod: https://www.dropbox.com/s/wnnw276dklrwi ... 0.zip?dl=0

Reproduction steps,
1. /c game.local_player.insert{name="basic-beacon",count=1};game.local_player.insert{name="basic-beacon-2",count=1}
2. Place a beacon
3. Place another beacon on top of it
4. ?????
5. Crash

[posila]

hello_to_you_too()

Thanks for the report. And special thanks for superb minimal case! Fixed for 0.12.9