Error while running event dart::on_player_changed_surface (ID 57)
dart/scripts/dart.lua:530: attempt to index a nil value
stack traceback:
dart/scripts/dart.lua:530: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

Repro:
Have tier 3 factory
Have DART installed
Shift-right-click factory in map mode to enter

Error while running event dart::on_player_changed_surface (ID 57)
dart/scripts/dart.lua:530: attempt to index a nil value
stack traceback:
dart/scripts/dart.lua:530: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>

Repro:
Have tier 3 factory
Have DART installed
Shift-right-click factory in map mode to enter

Save is available for testing out (rather heavy modpack though...)

Misclicked. That was intended to be a reply.

I am currently traveling. Will have a look at this issue after returning in the middle of the next week.

Repro:
Have tier 3 factory

What does this mean? Is it another mod (couldn't find sth with this name)?

I have a vague idea what could be wrong, but to check (or to refute) it, your save file would be fine. Could you please post a link to it?

Link to mod: https://mods.factorio.com/mod/factorissimo-2-notnotmelon
Tier 3 is the highest tier one, the yellow one. May happen with others as well, untested.
Full save should be this one: https://hurtzcloud.xyz/s/A4mF7bxroottXWw

Do you still have problems with the latest version (published yesterday)?

Give me one moment to update and enable, will report back.

Take your time, I'm going to bed now anyway 😴

Good morning - how looks it like?

...I could have sworn I reported back.

Issue appears resolved, thank you!