The mod Tarantulator (2.1.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event tarantulator_V2::on_nth_tick(240)
tarantulator_V2/control.lua:19: attempt to perform arithmetic on field 'transfer_efficiency' (a nil value)
stack traceback:
tarantulator_V2/control.lua:19: in function <tarantulator_V2/control.lua:5>

Thank you for reporting this error! Unfortunately, I am unable to reproduce the issue. I have tested it with both the burner and void engine, and the error does not occur at settings of 1, 100, or 1000.

Could you please try running the game without other mods to check if the issue persists? Additionally, I would appreciate it if you could share the settings you have applied to the Tarantulator mod—a screenshot is perfectly fine.

At this point, I assume that the error is caused by another mod. If I don't know which one is responsible, unfortunately, I won’t be able to fix it.

I have had a similar issue occur which happened as soon as I tried to move in my newly created tarantulator. It appears that the fault was in the exoskeleton - I previously had installed two exoskeletons, with which the error occured. I have now tried the same again, without the exoskeletons, at it appears to be working fine.

Thanks for sharing your experience—really helpful to know about the exoskeleton issue. I’ll take a closer look at it.

Just a quick note: all updates and support for the Tarantulator mod are now exclusively handled on the official mod page.
https://mods.factorio.com/mod/tarantulator

This version here is deprecated and no longer maintained.

Thanks for sharing your experience—really helpful to know about the exoskeleton issue. I’ll take a closer look at it.

Just a quick note: all updates and support for the Tarantulator mod are now exclusively handled on the official mod page.
https://mods.factorio.com/mod/tarantulator

This version here is deprecated and no longer maintained.

Yeah I've noticed that, already made a more detailed analysis of the problem there. It seems to be dependent on the energy grid transfer. Sometimes, the energy grid will just not transfer any energy. Sometimes it will crash the game. Sometimes it will work (at least it worked once with a cheat-spawned tarantulator) but it only worked until I saved + exited the game, and when I started it again the energy grid transfer was broken again, no more energy got transferred.

According to a quick fix that one of my friends made for me it's "just Ctrl-R global>storage" whatever that means. Hope this helps for creating an official fix.