How do I fix this warning?

I keep getting this annoying warning and i dont know how to fix it.

Spoiler: WARNING

Warning: Creating default object from empty value in /home/icefac/plugins/Core/src/Junkdude/Utils.php on line 168

Here's the code btw.

PHP:

case 1:
            $book->setCustomName(TF::YELLOW."Custom Enchant Book"."\n".TF::GREEN."Blindness I");
            $book->addEnchantment(Enchantment::getEnchantment(101)->setLevel(1));
            $tag = $book->getNamedTag() ?? new CompoundTag("", []);
            $tag->namedtag->cebook = new IntTag("cebook", 1);
            $book->addEnchantment(Enchantment::getEnchantment(100)->setLevel(1));
            $book->setNamedTag($tag);
            $p->getInventory()->addItem($book);
            return;

 

What is line 168?

 

Read the error. "Empty object". Now i could be wrong, but this looks like an empty object
new CompoundTag("", []); (the [] bit)

 

@SavionLegendZzz line 168 is $tag->namedtag->cebook = new IntTag("cebook", 1);

 

halp

 

You didn't define $tag->namedtag

 

*facepalm*