Error while running event Long_Range_Delivery_Drones::on_tick (ID 0) ...e_Delivery_Drones__/script/long-range-delivery-drone.lua:331: bad argument #1 of 2 to 'next' (table expected, got nil) stack traceback: [C]: in function 'next' ...e_Delivery_Drones__/script/long-range-delivery-drone.lua:331: in function 'deliver_to_target' ...e_Delivery_Drones__/script/long-range-delivery-drone.lua:494: in function 'update' ...e_Delivery_Drones__/script/long-range-delivery-drone.lua:1256: in function 'update_drones' ...e_Delivery_Drones__/script/long-range-delivery-drone.lua:1300: in function 'handler' core/lualib/event_handler.lua:72: in function <core/lualib/event_handler.lua:70>