I got this message on loading map:
Error while running event ElectricTrain::on_tick (ID 0)
Can't set currently burning to an item without a fuel value
stack traceback:
ElectricTrain/lua/logic_event_handler.lua:77: in function <ElectricTrain/lua/logic_event_handler.lua:55>
stack traceback:
[C]: in function 'newindex'
__ElectricTrain/lua/logic_event_handler.lua:77: in function <ElectricTrain/lua/logic_event_handler.lua:55>

Another error on E-Loco placement:
Error while running event ElectricTrain::on_built_entity (ID 6)
Can't set currently burning to an item without a fuel value
stack traceback:
ElectricTrain/lua/logic_event_handler.lua:11: in function <ElectricTrain/lua/logic_event_handler.lua:4>
stack traceback:
[C]: in function 'newindex'
__ElectricTrain/lua/logic_event_handler.lua:11: in function <ElectricTrain/lua/logic_event_handler.lua:4>

unfortunately, I can't understand it. do you use other mods and which factorio version do you use? i'll do a few more tests, but I'm currently unable to generate the error.

Peter what mods do you use it with? Got the same error in 0.17 in multiplayer while placing a train.
TSM?
Event-Handler mod?

I fixed it for myself by changing line 7 in lua/basic_event_handler.lua to:
global.Fuel = game.item_prototypes['et-electric-locomotive-fuel']
and "et-electric-locomotive-fuel" deepcopy i changed from "wood" to "nuclear-fuel"
i dont know if i broke something, but for now, its working.

My mods:
https://pastebin.com/8SQ2G5zy

did you update this mod from 0.16 or started a new game?

updated from 0.16

i started a new game so seems to be an error on both

i played with 0.17.6 before, and after the update today i get this.

Error while running event ElectricTrain::on_tick (ID 0)
Can't set currently burning to an item without a fuel value
stack traceback:
ElectricTrain/lua/logic_event_handler.lua:77: in function <ElectricTrain/lua/logic_event_handler.lua:55>
stack traceback:
[C]: in function 'newindex'
__ElectricTrain/lua/logic_event_handler.lua:77: in function <ElectricTrain/lua/logic_event_handler.lua:55>

related?

changing "et-electric-locomotive-fuel" deepcopy from "wood" to "nuclear-fuel" worked for me as well, did not change anything else

I used both of the fixes (global.fuel as well as 'wood' -> 'nuclear-fuel'), and the problem is still persisting. It seems mine is throwing the error on placement, not during the OnTick:

Error while running event ElectricTrain::on_built_entity (ID 6)
Can't set currently burning to an item without a fuel value
stack traceback:
ElectricTrain/lua/logic_event_handler.lua:11: in function <ElectricTrain/lua/logic_event_handler.lua:4>
stack traceback:
[C]: in function 'newindex'
__ElectricTrain/lua/logic_event_handler.lua:11: in function <ElectricTrain/lua/logic_event_handler.lua:4>

To my knowedge, the game thinks that the 'et-electric-locomotive-fuel' doesn't have a burn time, even though it is supposed to be a deep copy of the 'wood' or 'nuclear-fuel' items.

Since I just stumbled across a solution, I feel obligated to provide the solution I found: in the file logic_event_handler.lua, I replaced every instance of "global.Fuel" with "game.item_prototypes['et-electric-locomotive-fuel']". This includes instances that has ".fuel_value" appended, where I left those alone.

It seems, for some reason or another, the game doesn't like the generic global.Fuel. I'm partially sure that it got initialized and that the correct values were stored, but I really don't understand what was going wrong. At least it's acting like it's supposed to now...

a new version is online. its the first attempt to fix the issue.

For me it is just the opposite, version 0201 works fine with new or old 0.16 games. But version 3 shows the same error of Peter9184 and mobsterer with old 0.16 games. A new saved game worked. Stepped back to 0201 and all worked fine again.

BTW, you should skip the versioning to 0.17.202. Then automatic updates should work again.

I got that error today, "Peter9184"s solution did not fix the problem, only after I added "Coolguybest"s solution, then it works.

error is still in sadly :(

Same here, but with a save that has never seen .16
Ive had to remove deadlock stacking due to it having issues with latest yuoki and angelpetrochem, and on loading the save after removing that, got the error...this maybe unrelated
factorio is latest version, all mods latest versions

Full error from log -
https://pastebin.com/raw/rE0YLMNk

Just to add, non of my trains actually have any fuel in them, they charge at ltn depot and dont use "fuel"

And I can confirm the fixes listed above worked for me....