Hey, first of all thank for that great mod, really like the new mechanic.
I get crashes while loading a savefile (from factorio 0.18.18-1) with the following mods:

Construction Drones 0.4.11
FNEI 0.3.0
Krastorio2 0.9.11
Mining_Drones 0.5.3
VehicleSnap 1.18.1
YARM 0.8.101
aai-signal-transmission 0.2.3
alien-biomes 0.5.2
base 0.18.18
even-distribution 0.3.17
factoryplanner 0.18.11
jetpack 0.1.13
road-grid 0.0.3
robot_attrition 0.4.2
space-exploration 0.2.16
space-exploration-graphics 0.2.1
space-exploration-hr-graphics 0.2.1
space-exploration-postprocess 0.2.4
windturbines 0.18.11

The error message is the following:

Error while running event Transport_Drones::on_configuration_changed
Transport_Drones/script/depot_common.lua:124: attempt to index local 'node' (a nil value)
stack traceback:
Transport_Drones/script/depot_common.lua:124: in function 'add_depot_to_node'
Transport_Drones/script/depot_common.lua:372: in function 'on_configuration_changed'
core/lualib/event_handler.lua:87: in function <core/lualib/event_handler.lua:84>

I got the crashes after updating factorio and my mods to 0.18.19, I'm currently on version 0.18.21, the only mod that relies on yours is road-grid by Soggs. A new savegame with the same mods starts without problems.

This is the savefile if that helps: https://drive.google.com/open?id=1ptBXTj1j9FefmS4C1y02TUEWROmY8GP9

Hey, first of all thank for that great mod, really like the new mechanic.
I get crashes while loading a savefile (from factorio 0.18.18-1) with the following mods:

Construction Drones 0.4.11
FNEI 0.3.0
Krastorio2 0.9.11
Mining_Drones 0.5.3
VehicleSnap 1.18.1
YARM 0.8.101
aai-signal-transmission 0.2.3
alien-biomes 0.5.2
base 0.18.18
even-distribution 0.3.17
factoryplanner 0.18.11
jetpack 0.1.13
road-grid 0.0.3
robot_attrition 0.4.2
space-exploration 0.2.16
space-exploration-graphics 0.2.1
space-exploration-hr-graphics 0.2.1
space-exploration-postprocess 0.2.4
windturbines 0.18.11

The error message is the following:

Error while running event Transport_Drones::on_configuration_changed
Transport_Drones/script/depot_common.lua:124: attempt to index local 'node' (a nil value)
stack traceback:
Transport_Drones/script/depot_common.lua:124: in function 'add_depot_to_node'
Transport_Drones/script/depot_common.lua:372: in function 'on_configuration_changed'
core/lualib/event_handler.lua:87: in function <core/lualib/event_handler.lua:84>

I got the crashes after updating factorio and my mods to 0.18.19, I'm currently on version 0.18.21, the only mod that relies on yours is road-grid by Soggs. A new savegame with the same mods starts without problems.

This is the savefile if that helps: https://drive.google.com/open?id=1ptBXTj1j9FefmS4C1y02TUEWROmY8GP9

EDIT: dang, realised i posted under the wrong tag

There was some depot without road tile for some reason.

I added a satefy check, it should load now, and corrupt depots should try to correct themselves (which worked in your case), and if they can't correct they will kill themselves....

Thank you very much! I will check it in a few hours.