Offlineplayer that has not joined the server returns null in variable

[BladeMC1]

command /fpa [<Text>] [<offlineplayer>]:
    permission: sa.as
    trigger:
        if arg 1 is "isim":
            add arg-2 to {fa::*}
            send "Başarı ile %arg-2% &feklendi" to player

I add people with this command and when I add: http://prntscr.com/p6a5sh
When you restart the server: http://prntscr.com/p6a5xa

Server and skript relase: http://prntscr.com/p6cdca

[ShaneBeee]

1. Any version other than the newest version of Skript is no longer supported
2. 1.8.8 and below has never been supported by this fork
3. When creating a new issue, please don't delete the template, actually fill it in.

[Blueyescat]

I can confirm this on a Paper 1.13.2 server with Skript 2.4-beta7, happens if the offline player saved in a variable has never played on the server.

According to Bukkit/Spigot docs this is not a new thing but also not related to Skript, though it shouldn't be returning null. Probably return the UUID?
https://hub.spigotmc.org/javadocs/spigot/org/bukkit/OfflinePlayer.html#getName--

[FranKusmiruk]

Be aware that even if this bug is fixed, neither your minecraft version nor your Skript version is supported anymore so you won't be able to solve this without updating.