Error when I summon primed-tnt

Hello, i'm developing a custom TNT plugin that "currently" lets you choose the TNT priming time
But it seems like it activates the event multiple times or something...
To be honest, I don't know whats wrong here

Code:

@EventHandler
    public void onPrime(EntitySpawnEvent event) {
            if (!getConfig().getBoolean("Insta prime")) {
                if (event.getEntity().getType() == EntityType.PRIMED_TNT && event.getEntity().getCustomName() == null) {
                    var pL = event.getEntity().getLocation();
                    var pW = event.getEntity().getWorld();
                    TNTPrimed tnt = (TNTPrimed) pW.spawnEntity(pL, EntityType.PRIMED_TNT);
                    tnt.setFuseTicks(config.getInt("Priming time"));
                    tnt.setCustomName("TNT");
                    tnt.setCustomNameVisible(true);
                    event.setCancelled(true);
                }
        }
    }
}

Error message from config: https://pastebin.com/j1JELPAz

 

How do i fix it? I've tried naming the tnt's

 

@timtower I did not know that was possible...

I got it working!
Here is the code, if anyone is curious

Code:

@EventHandler
    public void onPrime(EntitySpawnEvent event) {
        if (event.getEntity() instanceof TNTPrimed) {
            if (!getConfig().getBoolean("Insta prime")) {
                        ((TNTPrimed)event.getEntity()).setFuseTicks(getConfig().getInt("Priming time"));
                }
        }
    }

EDIT by Moderator: merged posts, please use the edit button instead of double posting.