Not sure what people where doing when the MP server crashed, but here is the log

Please report this error to the mod author.

Error while running event Construction_Drones::on_ai_command_completed (ID 113)
__Construction_Drones__/script/construction_drone.lua:1521: attempt to index local 'offset' (a nil value)
stack traceback:
    __Construction_Drones__/script/construction_drone.lua:1521: in function 'update_drone_sticker'
    __Construction_Drones__/script/construction_drone.lua:1804: in function <__Construction_Drones__/script/construction_drone.lua:1739>
    (...tail calls...)
    __core__/lualib/event_handler.lua:44: in function <__core__/lualib/event_handler.lua:42>
9305.529 Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "The mod Construction Drones (0.4.9) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event Construction_Drones::on_ai_command_completed (ID 113)
__Construction_Drones__/script/construction_drone.lua:1521: attempt to index local 'offset' (a nil value)
stack traceback:
    __Construction_Drones__/script/construction_drone.lua:1521: in function 'update_drone_sticker'
    __Construction_Drones__/script/construction_drone.lua:1804: in function <__Construction_Drones__/script/construction_drone.lua:1739>
    (...tail calls...)
    __core__/lualib/event_handler.lua:44: in function <__core__/lualib/event_handler.lua:42>"

appears to be down to picking things off the ground, it that's any help.