Hooking yourself causes server to crash?

I've been told that a fisherman kit I coded makes the server crash when you hook yourself. I think this may be caused by the hook hitting the player while sneaking and can't pick up who is throwing it, or it's creating a paradox loop somehow.
There's no way to fix this because there's no FishingHook projectile/entity to cast anything to.
Also, the ProjectileHitEvent can't pick up the Entity that gets hit, only the entity that gets launched, so I can't check if the projectile launcher is the thing the projectile hits.

What can be a solution to this?

 

I am not sure If I understand what you want. Do you want to check if you hit yourself?
If yes, does PlayerFishEvent not works for you?

Code:

@EventHandler
public void onFishing(PlayerFishEvent event) {
    Player player = event.getPlayer();
    if (event.getState() == PlayerFishEvent.State.CAUGHT_ENTITY) {
        if (event.getCaught().getType() == EntityType.Player) {
            Player caughtPlayer = (Player) event.getCaught();
            if (player.getName().equalsIgnoreCase(caughtPlayer.getName())) {
                //  yourself
            }
        }
    }
}