You are doing something weird in [unpack] object?
Never seen this one before. Can you share the patch (ideally something minimized to make it easier to read) so we can investigate?
I meant sharing the actual patch file. I don’t want to redo your entire patch based on some images 
Minimize it to a state that reproduces the issue.
[edit: it actually has nothing to do with with the PD [unpack] object but with some internal python code haha. So I will definitely need a proper patch file that gives the error!
You can send it to me in private message if you want.]
Thank you for sharing the patch in private.
I found the issue and it has to do with using diacritics in your send and receive objects.
Like [s velocità_generazione_grani]. If you write the patch without these I think it will work!
Now I need to find how to circumvent this problem. Kind of silly that in over 10 years nobody ran into this issue!
Thanks a lot, this probably happens because I assign names in Italian, which, unlike English, has a lot of diacritics (and it probably wasn’t foreseen hahaha)