Received error on startup for mini-machine version 9.3.26:
Failed to load mods: __mini-machines__/prototypes/copy-final-fixes.lua:258: attempt to concatenate field 'fast_replaceable_group' (a nil value) stack traceback: __mini-machines__/prototypes/copy-final-fixes.lua:258: in main chunk [C]: in function 'require' __mini-machines__/data-final-fixes.lua:3: in main chunk

Not all machines have a fast_replaceable_group field value. Please null check, thanks! Love the mod!

Hm, I guess I didn't test with the space age machines, but it worked with all of the default vanilla machines I tested. Little bit annoying, but I suppose I should be able to just set it manually in those cases.

Ahh, I had a feeling it would be space age specific: the biolab, heating tower, and lightning collector don't have fast replaceable groups defined. A new group is defined for these (even though it's unlikely they will ever have more than one tier to use the fast-replace functionality), and the same logic should also apply if the fast_replaceable_group is removed for whatever reason.

Implemented in v9.3.27

Thanks Kryzeth!