Add null checks for playerData in PlayerListener

Added null checks for playerData in the methods onPlayerQuit, onPlayerTeleport and onPlayerDeath of the PlayerListener class. This addresses potential issues where plugins are using players as entities, which can sometimes cause playerData to be null.

src/main/java/me/youhavetrouble/preventstabby/data/PlayerListener.java

@@ -46,6 +46,7 @@ public class PlayerListener implements Listener {
         Player player = event.getPlayer();
         if (!PreventStabby.getPlugin().getConfigCache().punish_for_combat_logout) return;
         PlayerData playerData = PreventStabby.getPlugin().getPlayerManager().getPlayer(player.getUniqueId());
+        if (playerData == null) return;
         if (!playerData.isInCombat()) return;
         player.setHealth(0);
         if (!PreventStabby.getPlugin().getConfigCache().punish_for_combat_logout_announce) return;
@@ -56,6 +57,7 @@ public class PlayerListener implements Listener {
     public void onPlayerTeleport(PlayerTeleportEvent event) {
         Player player = event.getPlayer();
         PlayerData playerData = PreventStabby.getPlugin().getPlayerManager().getPlayer(player.getUniqueId());
+        if (playerData == null) return; // Plugins using players as entities can cause this state
         playerData.setTeleportTimestamp(Instant.now().getEpochSecond());
     }
 
@@ -63,7 +65,7 @@ public class PlayerListener implements Listener {
     public void onPlayerDeath(EntityDeathEvent event) {
         if (!(event.getEntity() instanceof Player player)) return;
         PlayerData playerData = PreventStabby.getPlugin().getPlayerManager().getPlayer(player.getUniqueId());
-        if (playerData == null) return;
+        if (playerData == null) return; // Plugins using players as entities can cause this state
         playerData.markNotInCombat();
     }