Prevent IndexOutOfBoundsException when using the item command.

data/plugins/cmd-item/item.rb

@@ -1,18 +1,24 @@
 require 'java'
 
+# Adds the specified item to the player's own inventory.
 on :command, :item, RIGHTS_ADMIN do |player, command|
   args = command.arguments
   if (1..2).include? args.length
     id = args[0].to_i
     amount = args.length == 2 ? args[1].to_i : 1
+    if (id < 0 || id >= ItemDefinition.count)
+      player.send_message('The item id you specified is out of bounds!')
+      next
+    end
 
     player.inventory.add(id, amount)
   else
-    player.send_message "Syntax: ::item [id] [amount=1]"
+    player.send_message('Syntax: ::item [id] [amount=1]')
   end
 end
 
-on :command, :remove, RIGHTS_ADMIN do |player, command|
+# Removes the specified item from the player's own inventory.
+on :command, :remove, RIGHTS_MOD do |player, command|
   args = command.arguments
   if (1..2).include? args.length
     id = args[0].to_i
@@ -20,10 +26,11 @@ on :command, :remove, RIGHTS_ADMIN do |player, command|
 
     player.inventory.remove(id, amount)
   else
-    player.send_message "Syntax: ::remove [id] [amount=1]"
+    player.send_message('Syntax: ::remove [id] [amount=1]')
   end
 end
 
+# Clears the player's own inventory.
 on :command, :empty, RIGHTS_MOD do |player, command|
   player.inventory.clear
 end