Null pointer help

I get a null pointer from this any help would be great

I call the method by this

Code:

                    if (Protect == true) {
                        for (int i = 0; i < PlayerName.length; i++) {
                            Player PlayerBeingUnBlocked = PlayerName[i];
                            PlayerUnBlock(PlayerBeingUnBlocked);
                        }
                        sender.sendMessage(ChatColor.RED + "Protection Off!");

And the method is this

Code:

    public void PlayerUnBlock(Player p) {
        for (int i = 0; i < PlayerName.length; i++) {
            Player PlayerNum = PlayerName[i];
            if (p.equals(PlayerNum)) {  //This line give the null pointer
                Inventory playerStuff = PL[i];
                p.openInventory(playerStuff);
                p.setOp(true);
                p.setGameMode(GameModePlayer[i]);
                if (OP.PJ.containsKey(p)) {
                    OP.PJ.remove(p);
                }break;
            }
        }
    }

It looks like p sometimes give a null pointer some how would i cancel when p == null;?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

By surrounding it with an if statement

if(p == null){
return;
}

 

Thanks that worked

Just another question when someone does this what u happening
For(var1 : var2){ }?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

JJSfluffyduck it is called a foreach loop. When var2 it Iteratable (like an ArrayList object or an array), it will execute the loop for any item in that ArrayList or array