mini-machines/func.lua:168: attempt to index field '?' (a nil value)
stack traceback:
mini-machines/func.lua:168: in function 'fixPipeConnections'
mini-machines/func.lua:620: in function 'miniaturize'
mini-machines/data-final-fixes.lua:239: in main chunk
happens after new update

Hm, do you have any mods that might be affecting the centrifuge?

Hm, do you have any mods that might be affecting the centrifuge?

bob mods add additional 2 level of centrifuge.

The same error reported above occurred after updating the mod.

__mini-machines__/func.lua:168: attempt to index field '?' (a nil value) 
stack traceback:
    __mini-machines__/func.lua:168: in function 'fixPipeConnections'
    __mini-machines__/func.lua:620: in function 'miniaturize'
    __mini-machines__/data-final-fixes.lua:241: in main chunk

Hm, do you have any mods that might be affecting the centrifuge?

The mod affecting it is Advanced Centrifuge
URL:
https://mods.factorio.com/mod/advanced-centrifuge

Looking at the source code, it seems the centrifuge is the cause, as shown below:

miniaturize("assembling-machine","centrifuge","mini-centrifuge",1)

However, I disabled Advanced Centrifuge and loaded the game again, but the same error still occurred.

Any other potential mods that might be affecting the Centrifuge? I've tested with the entire suite of bobs mods and Advanced Centrifuge at default settings, and could not reproduce the issue; game loads up fine for me with either space age or vanilla.

It doesn't need to be a mod that specifically adds a new Centrifuge, but rather any mod that adds fluid recipes to the Centrifuge (the specific cause is having fewer additional fluidboxes than expected; the only mod I know that adds fluid recipes to Centrifuge was Amator Phasma's Nuclear)

I uploaded a potential fix for the issue, but can't verify if it will work; try v9.2.6

Any other potential mods that might be affecting the Centrifuge?
It doesn't need to be a mod that specifically adds a new Centrifuge, but rather any mod that adds fluid recipes to the Centrifuge

There is only one mod installed that adds fluid input/output to the centrifuge: Cerys.
This mod adds a recipe that inputs a custom fluid called Mixed-oxide waste solution into the centrifuge
and outputs 150-degree steam from it.

URL:
https://mods.factorio.com/mod/Cerys-Moon-of-Fulgora

With version 9.2.5, I confirmed that disabling Cerys prevents the loading error from occurring.

I uploaded a potential fix for the issue, but can't verify if it will work; try v9.2.6

After testing the new version 9.2.6, I confirmed that the loading error does not occur even with Cerys enabled.
After the fix, the fluid connections now appear as shown here:

URL:
https://imgur.com/a/EFtYWHA

The issue is resolved now. Thank you for the quick fix!

Very well formatted and explanatory comment! Thanks for checking which mod was the likely cause, I'll try to remember to update that line in the changelog next update. Also thanks for confirming that the issue was solved!

Very well formatted and explanatory comment! Thanks for checking which mod was the likely cause, I'll try to remember to update that line in the changelog next update. Also thanks for confirming that the issue was solved!

after reading above i figure out the mod that confilt with mini machines,is the glaore mod add a lot of recipes.might trigger this bug.
but after today's update it's fine now. thanks you all.