Removed a fluid depot,  tried to replace it caused a crash.  We updated the mod on an existing map.    Also the command /toggle-transport-depot-gui will not close once open.
121.255 Error MainLoop.cpp:1202: Exception at tick 44643917: The mod Transport Drones (0.5.3) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Transport_Drones::on_ai_command_completed (ID 113)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
Transport_Drones/script/depots/fluid_depot.lua:53: in function 'get_output_fluidbox'
Transport_Drones/script/depots/fluid_depot.lua:57: in function 'get_temperature'
Transport_Drones/script/transport_drone.lua:406: in function 'process_return_to_requester'
Transport_Drones/script/transport_drone.lua:515: in function 'update'
Transport_Drones/script/transport_drone.lua:599: in function 'handler'
core/lualib/event_handler.lua:44: in function <core/lualib/event_handler.lua:42>
stack traceback:
    [C]: in function 'index'
    __Transport_Drones/script/depots/fluid_depot.lua:53: in function 'get_output_fluidbox'
Transport_Drones/script/depots/fluid_depot.lua:57: in function 'get_temperature'
Transport_Drones/script/transport_drone.lua:406: in function 'process_return_to_requester'
Transport_Drones/script/transport_drone.lua:515: in function 'update'
Transport_Drones/script/transport_drone.lua:599: in function 'handler'
core/lualib/event_handler.lua:44: in function <core/lualib/event_handler.lua:42>
 121.258 Error ServerMultiplayerManager.cpp:90: MultiplayerManager failed: "The mod Transport Drones (0.5.3) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Transport_Drones::on_ai_command_completed (ID 113)
LuaEntity API call when LuaEntity was invalid.
stack traceback:
Transport_Drones/script/depots/fluid_depot.lua:53: in function 'get_output_fluidbox'
Transport_Drones/script/depots/fluid_depot.lua:57: in function 'get_temperature'
Transport_Drones/script/transport_drone.lua:406: in function 'process_return_to_requester'
Transport_Drones/script/transport_drone.lua:515: in function 'update'
Transport_Drones/script/transport_drone.lua:599: in function 'handler'
core/lualib/event_handler.lua:44: in function <core/lualib/event_handler.lua:42>
stack traceback:
    [C]: in function 'index'
    __Transport_Drones/script/depots/fluid_depot.lua:53: in function 'get_output_fluidbox'
Transport_Drones/script/depots/fluid_depot.lua:57: in function 'get_temperature'
Transport_Drones/script/transport_drone.lua:406: in function 'process_return_to_requester'
Transport_Drones/script/transport_drone.lua:515: in function 'update'
Transport_Drones/script/transport_drone.lua:599: in function 'handler'
core/lualib/event_handler.lua:44: in function <core/lualib/event_handler.lua:42>"
 121.259 Info ServerMultiplayerManager.cpp:774: updateTick(44643917) changing state from(InGame) to(Failed)
 121.260 Quitting: multiplayer error.