diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2c02566
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,17 @@
+# Eclipse
+.classpath
+.project
+.settings/
+
+# Intellij
+.idea/
+*.iml
+*.iws
+out
+
+# Mac
+.DS_Store
+
+# Maven
+log/
+target/
\ No newline at end of file
diff --git a/src/net/jitse/npclib/api/NPC.java b/src/net/jitse/npclib/api/NPC.java
index cdb08b8..e2ca5c6 100644
--- a/src/net/jitse/npclib/api/NPC.java
+++ b/src/net/jitse/npclib/api/NPC.java
@@ -11,6 +11,7 @@ import net.jitse.npclib.events.NPCDestroyEvent;
 import net.jitse.npclib.events.NPCSpawnEvent;
 import net.jitse.npclib.events.trigger.TriggerType;
 import net.jitse.npclib.skin.Skin;
+import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.entity.Player;
 import org.bukkit.plugin.java.JavaPlugin;
@@ -38,27 +39,35 @@ public abstract class NPC {
     protected Location location;
 
     public NPC(JavaPlugin plugin, Skin skin, double autoHideDistance, List<String> lines) {
-        if (skin == null) {
-            throw new IllegalArgumentException("Skin cannot be null.");
-        }
-
         this.plugin = plugin;
         this.skin = skin;
         this.autoHideDistance = autoHideDistance;
-        this.lines = (lines == null ? new ArrayList<>() : lines);
+        this.lines = (lines == null ? Collections.emptyList() : lines);
 
         NPCManager.add(this);
     }
 
     protected GameProfile generateGameProfile(UUID uuid, String name) {
         GameProfile gameProfile = new GameProfile(uuid, name);
-        gameProfile.getProperties().removeAll("textures");
-        gameProfile.getProperties().put("textures", new Property("textures", skin.getValue(), skin.getSignature()));
+
+        if (skin != null) {
+            gameProfile.getProperties().put("textures", new Property("textures", skin.getValue(), skin.getSignature()));
+        }
+
         return gameProfile;
     }
 
     public void destroy() {
         NPCManager.remove(this);
+
+        // Destroy NPC for every player that is still seeing it.
+        for (UUID uuid : shown) {
+            if (autoHidden.contains(uuid)) {
+                continue;
+            }
+
+            hide(Bukkit.getPlayer(uuid), true);
+        }
     }
 
     public Set<UUID> getShown() {
diff --git a/src/net/jitse/npclib/listeners/PlayerMoveListener.java b/src/net/jitse/npclib/listeners/PlayerMoveListener.java
index b30aa88..430ead2 100644
--- a/src/net/jitse/npclib/listeners/PlayerMoveListener.java
+++ b/src/net/jitse/npclib/listeners/PlayerMoveListener.java
@@ -11,6 +11,7 @@ import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.player.PlayerMoveEvent;
+import org.bukkit.event.player.PlayerTeleportEvent;
 
 /**
  * @author Jitse Boonstra
@@ -26,23 +27,31 @@ public class PlayerMoveListener implements Listener {
             return;
         }
 
-        Player player = event.getPlayer();
+        handleMove(event.getPlayer());
+    }
 
+    @EventHandler
+    public void onPlayerTeleport(PlayerTeleportEvent event) {
+        handleMove(event.getPlayer());
+    }
+
+    private void handleMove(Player player) {
         for (NPC npc : NPCManager.getAllNPCs()) {
             if (!npc.getShown().contains(player.getUniqueId())) {
                 continue; // NPC was never supposed to be shown to the player.
             }
 
-            double distance = player.getLocation().distance(npc.getLocation());
+            double hideDistance = npc.getAutoHideDistance();
+            boolean inRange = player.getLocation().distanceSquared(npc.getLocation()) <= (hideDistance * hideDistance);
             if (npc.getAutoHidden().contains(player.getUniqueId())) {
                 // Check if the player and NPC are within the range to sendShowPackets it again.
-                if (distance <= npc.getAutoHideDistance()) {
+                if (inRange) {
                     npc.show(player, true);
                     npc.getAutoHidden().remove(player.getUniqueId());
                 }
             } else {
                 // Check if the player and NPC are out of range to sendHidePackets it.
-                if (distance > npc.getAutoHideDistance()) {
+                if (!inRange) {
                     npc.hide(player, true);
                     npc.getAutoHidden().add(player.getUniqueId());
                 }
diff --git a/src/net/jitse/npclib/plugin/NPCLibPlugin.java b/src/net/jitse/npclib/plugin/NPCLibPlugin.java
index b2884dd..aa82a34 100644
--- a/src/net/jitse/npclib/plugin/NPCLibPlugin.java
+++ b/src/net/jitse/npclib/plugin/NPCLibPlugin.java
@@ -8,7 +8,6 @@ import net.jitse.npclib.NPCLib;
 import net.jitse.npclib.api.NPC;
 import net.jitse.npclib.plugin.listeners.NPCListener;
 import net.jitse.npclib.skin.MineSkinFetcher;
-import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
 import org.bukkit.entity.Player;
 import org.bukkit.event.EventHandler;
@@ -28,8 +27,8 @@ public class NPCLibPlugin extends JavaPlugin implements Listener {
     @Override
     public void onEnable() {
         this.npcLib = new NPCLib(this);
-        Bukkit.getConsoleSender().sendMessage(ChatColor.BLUE + "[NPCLib] " + ChatColor.WHITE + "plugin enabled.");
-        Bukkit.getConsoleSender().sendMessage(ChatColor.BLUE + "[NPCLib] " +
+        getServer().getConsoleSender().sendMessage(ChatColor.BLUE + "[NPCLib] " + ChatColor.WHITE + "plugin enabled.");
+        getServer().getConsoleSender().sendMessage(ChatColor.BLUE + "[NPCLib] " +
                 ChatColor.GRAY + "This is a test plugin usually used for development reasons. " +
                 "You can spawn NPCs by pressing [shift] in game.");
 
@@ -40,7 +39,7 @@ public class NPCLibPlugin extends JavaPlugin implements Listener {
 
     @Override
     public void onDisable() {
-        Bukkit.getConsoleSender().sendMessage(ChatColor.BLUE + "[NPCLib] " + ChatColor.WHITE + "plugin disabled.");
+        getServer().getConsoleSender().sendMessage(ChatColor.BLUE + "[NPCLib] " + ChatColor.WHITE + "plugin disabled.");
     }
 
     @EventHandler
@@ -57,7 +56,7 @@ public class NPCLibPlugin extends JavaPlugin implements Listener {
             ));
             npc.create(event.getPlayer().getLocation());
 
-            for (Player player : Bukkit.getOnlinePlayers()) {
+            for (Player player : getServer().getOnlinePlayers()) {
                 npc.show(player);
             }
         });