4880.851 Error MainLoop.cpp:1202: Exception at tick 20947817: The mod Transport Drones (0.6.0) 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/supply_depot.lua:108: in function 'get_available_item_count'
Transport_Drones/script/transport_drone.lua:275: in function 'process_pickup'
Transport_Drones/script/transport_drone.lua:540: in function 'update'
Transport_Drones/script/transport_drone.lua:670: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>
stack traceback:
[C]: in function 'index'
__Transport_Drones/script/depots/supply_depot.lua:108: in function 'get_available_item_count'
Transport_Drones/script/transport_drone.lua:275: in function 'process_pickup'
Transport_Drones/script/transport_drone.lua:540: in function 'update'
Transport_Drones/script/transport_drone.lua:670: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

I was using construction drones to pick it up.

I'm getting a similar crash when deconstructing a buffer depot with a repair turret.

The mod Transport Drones (0.6.0) 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/buffer_depot.lua:340: in function 'get_output_inventory'
Transport_Drones/script/depots/buffer_depot.lua:383: in function 'get_current_amount'
Transport_Drones/script/depots/buffer_depot.lua:492: in function 'get_available_item_count'
Transport_Drones/script/transport_drone.lua:275: in function 'process_pickup'
Transport_Drones/script/transport_drone.lua:540: in function 'update'
Transport_Drones/script/transport_drone.lua:670: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>
stack traceback:
[C]: in function 'index'
__Transport_Drones/script/depots/buffer_depot.lua:340: in function 'get_output_inventory'
Transport_Drones/script/depots/buffer_depot.lua:383: in function 'get_current_amount'
Transport_Drones/script/depots/buffer_depot.lua:492: in function 'get_available_item_count'
Transport_Drones/script/transport_drone.lua:275: in function 'process_pickup'
Transport_Drones/script/transport_drone.lua:540: in function 'update'
Transport_Drones/script/transport_drone.lua:670: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

ditto