Solved Could not pass event InventoryClickEvent

Hi, I have an error in my plugin and I don't know what am I doing wrong.
The error:

Code:

[12:54:38] [Server thread/ERROR]: Could not pass event InventoryClickEvent to TheTowersS v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:320) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:471) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1361) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.a(SourceFile:32) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.PacketPlayInWindowClick.handle(SourceFile:10) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:655) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:250) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:545) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
Caused by: java.lang.NullPointerException
    at io.github.galaipa.TheTowersS.Listener.onInventoryClick(Listener.java:44) ~[?:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_51]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_51]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:318) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-b3020jnks]
    ... 13 more

And my listener:

Code:java

 
package io.github.galaipa.TheTowersS;
 
import java.util.logging.Logger;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.inventory.ItemStack;
 
 
/**
*
* @author galaipa
*/
public final class Listener implements org.bukkit.event.Listener {
    public static final Logger log = Logger.getLogger("Minecraft");
      @EventHandler
        public void onInventoryClick(InventoryClickEvent e) {
          Player player = (Player) e.getWhoClicked();
          if ( e.getSlot()== 39){
              e.setCancelled(true);
              player.sendMessage(ChatColor.RED +"1");
          }
 
          else if (e.getCurrentItem().getType() == Material.LEATHER_HELMET || (e.getCurrentItem().getType() == Material.LEATHER_CHESTPLATE ) || (e.getCurrentItem().getType() == Material.LEATHER_BOOTS ) || (e.getCurrentItem().getType() == Material.LEATHER_LEGGINGS )){
              ItemStack a = e.getCurrentItem();
              player.getInventory().removeItem(a);
 
 
          }
 
 
 
        }
 
}
 

 

The clicked item can be null add a null check to fix that problem.

 

Seadragon91
Thanks!
I added this

Code:java

          if (e.getCurrentItem() == null){
          }