Map crashes when you click "Teleport" in a Sandbox-World

[mrbesen]

System Informations:
Linux Mint 19.1 64Bit
Kernel: 4.15.0-54
Factorio Version: 0.16.51
Mod Version: 0.16.1
No other Mods installed

Steps to reproduce:

• Create Sandbox World
• Placedown Teleporter
• create a power source somehow and connect it to the telporter
• wait for the telporter to charge up
• press teleport

This is the Error:

  Error MainLoop.cpp:1035: Exception at tick 44139: Error while running event Teleportation::on_gui_click (ID 1)
__Teleportation__/control-teleportation.lua:466: attempt to index a nil value

After accepting the Error, the map is closed without saving, but the game does not crash.

I think the mod should just disable teleportation in sandbox mode.