[Exolent[jNr]]

Don't keep the vault open the whole map since it is a file handle and not an actual vault.
Open it each time it's being used.

Also, don't use a loop if you are just reading a value for a known key. Use nvault_get().

Yes, nvault_set() will work, but nvault_open() and nvault_util_open() are 2 different handles so you cannot mix handles between the nvault and nvault util.