Using version 1.1.4, I got the following message and the game crashed. What happened is that I marked an area containing a bulk rail loader using the delete tool and it more or less instantly crashed. Might be bot related (there was a lot of bot activity going on), and if I remember correctly there was a train standing on top of the bulk rail (un-)loader.

14332.754 Error MainLoop.cpp:1285: Exception at tick 31959257: The mod Bulk Rail Loader (1.1.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event railloader::on_player_setup_blueprint (ID 69)
railloader/control.lua:356: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
railloader/control.lua:356: in function <railloader/control.lua:346>
14332.754 Error ServerMultiplayerManager.cpp:91: MultiplayerManager failed: "The mod Bulk Rail Loader (1.1.4) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event railloader::on_player_setup_blueprint (ID 69)
railloader/control.lua:356: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
railloader/control.lua:356: in function <railloader/control.lua:346>"
14332.755 Info ServerMultiplayerManager.cpp:780: updateTick(31959257) changing state from(InGame) to(Failed)