Solved Listener Problems

So I am coding a Plugin to manage my house with some cool features to practise coding. But I got a problem. I coded a Control panel to control the house. So I coded with the PlayerInteractEvent but I alwasy get a NullPointerException and I dont know how to squash it.
Code:

Code:Java

 
package creative.listener;
 
import org.bukkit.Location;
import org.bukkit.Material;
import org.bukkit.block.Block;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.inventory.ItemStack;
 
import creative.main.CreativeMain;
import creative.main.Utils;
 
public class PlayerInteractEvent implements Listener, Utils {
    CreativeMain main;
 
    public PlayerInteractEvent(CreativeMain main) {
        this.main = main;
    }
 
    @EventHandler
    public void onEvent(org.bukkit.event.player.PlayerInteractEvent e) {
 
        Player p = e.getPlayer();
 
        //Action action = e.getAction();
 
        Block m = e.getClickedBlock();
 
        Location sign = (new Location(p.getWorld(), 79, 68, -6));
 
        ItemStack stack = e.getItem();
 
        if (!(m.getType() == Material.OAK_SIGN)) {
            System.out.println(1);
            System.out.println(stack);
            if (stack.hasItemMeta()) {
                System.out.println(2);
                if (stack.getItemMeta().getDisplayName().equals("Control Panel")) {
                    p.openInventory(panelinv());
                }
            } else {
 
            }
        }
 
        System.out.println(3);
        if (m.getType() == Material.OAK_WALL_SIGN) {
            Location loc = m.getLocation();
            System.out.println(loc);
            if (loc.equals(sign)) {
                p.getInventory().addItem(panel());
 
            }
        }
 
    }
}
 
 

Error log:

Code:

 1
[15:31:15] [Server thread/INFO]: null
[15:31:15] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to PhilippsHouse v1.0
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:319) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:589) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:576) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at org.bukkit.craftbukkit.v1_15_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:442) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.PlayerInteractManager.a(PlayerInteractManager.java:441) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.PlayerConnection.a(PlayerConnection.java:1251) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:27) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.PacketPlayInUseItem.a(PacketPlayInUseItem.java:1) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:19) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.TickTask.run(SourceFile:18) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeTask(SourceFile:144) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.executeNext(SourceFile:118) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.MinecraftServer.ba(MinecraftServer.java:918) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.MinecraftServer.executeNext(MinecraftServer.java:911) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.IAsyncTaskHandler.awaitTasks(SourceFile:127) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.MinecraftServer.sleepForTick(MinecraftServer.java:895) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at net.minecraft.server.v1_15_R1.MinecraftServer.run(MinecraftServer.java:828) [spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.NullPointerException
        at creative.listener.PlayerInteractEvent.onEvent(PlayerInteractEvent.java:37) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:315) ~[spigot-1.15.2.jar:git-Spigot-ae72bf4-183139d]
        ... 19 more

Thanks for your Help ;D

 

@PhilDEV_Acc 'stack' is null.

 

if (!(m.getType() == Material.OAK_SIGN)) could just be: if(m.getType() != Material.OAK_SIGN)

and add a null check for both block and item: if(e.getClickedBlock() == null || e.getItem == null) return;

 

thanks that fixed the NullPointerException but why is 'stack' null?

 

@PhilDEV_Acc Because there was no item in your hand when you clicked.

 

How can I ignore what is in your hand?

 

By not referencing the item? Am i missing something from your question?