Enchantment returns NULL

I have a problem, when I try to enchant a thing, it kicks me. Screen from the logs attached. The code is below.

$rinstruments = array(15, 16, 18, 17);
$instruments = array(256, 257, 258, 269, 270, 271, 273, 274, 275, 277, 278, 279, 284, 285, 286);
if(in_array($item->getId(), $instruments)){
for($i = 0; $i != mt_rand(2, 3); $i++){
$item->addEnchantment(new EnchantmentInstance(Enchantment::getEnchantment($rinstruments[array_rand($rinstruments)]), mt_rand(1, 2)));
$player->getInventory()->setItemInHand($item);
}}

 

Do you test the program without randomize the enchantment level ?

It may occurs dues of the for loop

 

I tried it without randomization, sometimes it works, and sometimes it gives the same error.

 

NULL gives exactly when receiving an enchantment ID, the level does not affect this.

 

If you are trying to take a random element of $rinstruments, try this : §rinstruments[random_int(0,3)]

Or replace the 3 by : count($rinstruments)

If you don't want to take a random element of that, then I don't understand the code. Ima beginner in php

 

Doesn't work

 

This occurs because the enchantment with the ID 18 (fortune) isn't implemented in PocketMine yet.
See here: https://github.com/pmmp/PocketMine-...c/pocketmine/item/enchantment/Enchantment.php

 

Oh thank you.