[0.12.0] Crash: Singleplayer loaded in multiplayer

[provet]

It Is reproducible.

1: Start a new game in single-player
2: Save it in single-player
3: load it in multiplayer
4: Game crashes with following popup

Error:
Unexpected error occurred. You can help us to solve the problem by
posting the contents of the log file on the Factorio forums.

It's quite the bug as, any multiplayer game "converted" (see step 2-3) to a singleplayer game also will crash if loaded in multiplayer