[0.14.21] Error on running deserialization.

[Adil]

I'm getting the following error when trying to load savegame with my mod:

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It is not printed in log file or stdout, just this popup.
Whatever is that supposed to tell me and why is this happenning?

[Rseding91]

You're storing function closures in the global table which isn't supported as they don't save/load properly.

[Adil]

Yes, but it usually just strips them of upvalues and then runtime error happens which explicitly points to where upvalue was used. This message is outright useless as it is not even dumped completely.

[Rseding91]

Yes, but it usually just strips them of upvalues and then runtime error happens which explicitly points to where upvalue was used. This message is outright useless as it is not even dumped completely.

You can contact the people that maintain Lua and ask for a better error because that's where it's coming from

[Adil]

For the reference:
This was not caused by closures, it was caused by using complicated tables as keys for other table.
Tables as a key do not always cause this error, but when they do...