Failing to get specific player data

I need to add slowness when Survive Temperature get over 38, what i'm doing wrong? Script:

ServerEvents.tick(event => {

    const temperatureLevel = event.player.persistentData.ForgeData.survive.PlayerData.TemperatureStats.temperatureLevel;

    if (temperatureLevel && temperatureLevel > 38) {
        event.player.potionEffects.add("minecraft:slowness", 100, 0);
    }

});

persistantData is only data you set yourself through kubejs. You're looking for nbt, so just replace the ... .persistantData ... with ... .nbt ....

Thanks! I'll try it

of, i've changed the recipe to

ServerEvents.tick(event => {

    const temperatureLevel = event.player.nbt.ForgeData.survive.PlayerData.TemperatureStats.temperatureLevel;

    if (temperatureLevel > 38) {
        event.server.runCommandSilent('effect give @p minecraft:slowness 100 0')
    }

});

And now i'm getting this error:

try PlayerEvents.tick() instead

ServerEvents doesn't have a player

Yeah, i did changed it and another stuff and had no error, but it doesn't applied the slowness:

PlayerEvents.tick(player => {


    const surviveData = event.player.nbt.ForgeData['survive:PlayerData'];
    const temperatureLevel = surviveData.TemperatureStats.temperatureLevel


    if (temperatureLevel >= 38) {

        player.potionEffects.add("minecraft:slowness", 100, 0);
        return
    }

});

Not sure but try

PlayerEvents.tick(event  => {


    const surviveData = event.player.nbt.ForgeData['survive:PlayerData'];
    const temperatureLevel = surviveData.TemperatureStats.temperatureLevel


    if (temperatureLevel >= 38) {

        event.player.potionEffects.add("minecraft:slowness", 100, 0);
        return
    }

});

try using console.log and log each player its iterating on just so you can see what’s going on

You used "player" instead of "event" so in this function,the real player is "player.player"

Oh, i forgot to mention that i changed 'event' to 'player' to test, because with 'event' it was not working too :/

no any error in logs? I mean the error in the server.log

Sometimes it loads without errors, sometimes it give some "cannot read property"

Withou errors, but it doesn't work