Added checks in the events to prevent errors when Citizens NPCs perform tasks.

src/main/java/com/gmail/nossr50/listeners/BlockListener.java

@@ -123,6 +123,8 @@ public class BlockListener implements Listener {
         Player player = event.getPlayer();
         int id = block.getTypeId();
         Material type = block.getType();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         /* Code to prevent issues with placed falling Sand/Gravel not being tracked */
         if (type.equals(Material.SAND) || type.equals(Material.GRAVEL)) {
@@ -162,6 +164,9 @@ public class BlockListener implements Listener {
         }
 
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         PlayerProfile profile = Users.getProfile(player);
 
         if (profile == null) {
@@ -272,8 +277,11 @@ public class BlockListener implements Listener {
         final int LEAF_BLOWER_LEVEL = 100;
 
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         PlayerProfile profile = Users.getProfile(player);
-
+        
         if (profile == null) {
             return;
         }

src/main/java/com/gmail/nossr50/listeners/EntityListener.java

@@ -63,6 +63,8 @@ public class EntityListener implements Listener {
 
         Entity attacker = event.getDamager();
         Entity defender = event.getEntity();
+        
+        if(attacker.hasMetadata("NPC") || defender.hasMetadata("NPC")) return; // Check if either players is are Citizens NPCs
 
         if (attacker instanceof Projectile) {
             attacker = ((Projectile) attacker).getShooter();
@@ -114,6 +116,8 @@ public class EntityListener implements Listener {
         Entity entity = event.getEntity();
         DamageCause cause = event.getCause();
 
+        if(entity.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         if (!(entity instanceof LivingEntity)) {
             return;
         }
@@ -171,6 +175,8 @@ public class EntityListener implements Listener {
     @EventHandler (priority = EventPriority.MONITOR)
     public void onEntityDeath(EntityDeathEvent event) {
         LivingEntity entity = event.getEntity();
+        
+        if(entity.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         entity.setFireTicks(0);
         BleedTimer.remove(entity);
@@ -199,7 +205,9 @@ public class EntityListener implements Listener {
     @EventHandler (priority = EventPriority.HIGHEST, ignoreCancelled = true)
     public void onExplosionPrime(ExplosionPrimeEvent event) {
         Entity entity = event.getEntity();
-
+        
+        if(entity.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         if (entity instanceof TNTPrimed) {
             int id = entity.getEntityId();
 
@@ -221,6 +229,8 @@ public class EntityListener implements Listener {
     @EventHandler (priority = EventPriority.HIGHEST, ignoreCancelled = true)
     public void onEnitityExplode(EntityExplodeEvent event) {
         Entity entity = event.getEntity();
+        
+        if(entity.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         if (event.getEntity() instanceof TNTPrimed) {
             int id = entity.getEntityId();
@@ -242,6 +252,9 @@ public class EntityListener implements Listener {
     public void onFoodLevelChange(FoodLevelChangeEvent event) {
         if (event.getEntity() instanceof Player) {
             Player player = (Player) event.getEntity();
+            
+            if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+            
             PlayerProfile profile = Users.getProfile(player);
             int currentFoodLevel = player.getFoodLevel();
             int newFoodLevel = event.getFoodLevel();
@@ -314,7 +327,9 @@ public class EntityListener implements Listener {
     @EventHandler (priority = EventPriority.MONITOR)
     public void onEntityTame(EntityTameEvent event) {
         Player player = (Player) event.getOwner();
-
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         if (Permissions.getInstance().taming(player) && !event.getEntity().hasMetadata("mcmmoSummoned")) {
             PlayerProfile profile = Users.getProfile(player);
             EntityType type = event.getEntityType();

src/main/java/com/gmail/nossr50/listeners/HardcoreListener.java

@@ -20,6 +20,8 @@ public class HardcoreListener implements Listener {
     @EventHandler(priority = EventPriority.MONITOR)
     public void onPlayerDeath(PlayerDeathEvent event) {
         Player player = event.getEntity(); //Note this returns a Player object for this subevent
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         if (!Permissions.getInstance().hardcoremodeBypass(player)) {
             if (player.getKiller() != null && Config.getInstance().getHardcoreVampirismEnabled()) {

src/main/java/com/gmail/nossr50/listeners/PlayerListener.java

@@ -58,6 +58,9 @@ public class PlayerListener implements Listener {
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onPlayerWorldChangeEvent(PlayerChangedWorldEvent event) {
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         PlayerProfile profile = Users.getProfile(player);
 
         if (profile == null) {
@@ -87,6 +90,8 @@ public class PlayerListener implements Listener {
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onPlayerFish(PlayerFishEvent event) {
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         if (Permissions.getInstance().fishing(player)) {
             State state = event.getState();
@@ -119,6 +124,9 @@ public class PlayerListener implements Listener {
      */
     @EventHandler(ignoreCancelled = true)
     public void onPlayerPickupItem(PlayerPickupItemEvent event) {
+    	
+    	 if(event.getPlayer().hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+    	
         PlayerProfile profile = Users.getProfile(event.getPlayer());
 
         if (profile == null) {
@@ -137,6 +145,7 @@ public class PlayerListener implements Listener {
      */
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onPlayerLogin(PlayerLoginEvent event) {
+    	if(event.getPlayer().hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
         Users.addUser(event.getPlayer()).getProfile().actualizeRespawnATS();
     }
 
@@ -148,6 +157,8 @@ public class PlayerListener implements Listener {
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onPlayerQuit(PlayerQuitEvent event) {
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         /* GARBAGE COLLECTION */
 
@@ -163,6 +174,8 @@ public class PlayerListener implements Listener {
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onPlayerJoin(PlayerJoinEvent event) {
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
 
         //TODO: Locale ALL the things.
         if (Config.getInstance().getMOTDEnabled() && Permissions.getInstance().motd(player)) {
@@ -205,6 +218,7 @@ public class PlayerListener implements Listener {
 
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onPlayerRespawn(PlayerRespawnEvent event) {
+    	if(event.getPlayer().hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
         PlayerProfile profile = Users.getProfile(event.getPlayer());
 
         if (profile != null) {
@@ -220,6 +234,7 @@ public class PlayerListener implements Listener {
     @EventHandler(priority = EventPriority.LOW)
     public void onPlayerInteract(PlayerInteractEvent event) {
         Player player = event.getPlayer();
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
         Action action = event.getAction();
         Block block = event.getClickedBlock();
         ItemStack inHand = player.getItemInHand();
@@ -331,6 +346,9 @@ public class PlayerListener implements Listener {
     @EventHandler(priority = EventPriority.HIGH, ignoreCancelled = true)
     public void onPlayerChat(AsyncPlayerChatEvent event) {
         Player player = event.getPlayer();
+        
+        if(player.hasMetadata("NPC")) return; // Check if this player is a Citizens NPC
+        
         PlayerProfile profile = Users.getProfile(player);
 
         if (profile == null) {