Plugin Error

Error: Call to a member function getContents() on null
File: plugins/TeleportSystem_v1.0.0/src/korado531m7/InventoryMenuAPI/InventoryMenu
Line: 169
Type: Error

THIS CRASH WAS CAUSED BY A PLUGIN
BAD PLUGIN: TeleportSystem v1.0.0

Code:
[160] $tag = new CompoundTag();
[161] $tag->setString('CustomName', $this->getName());
[162] IMU::sendTagData($player, $tag, $pos);
[163] }
[164]
[165] /**
[166] * this function is for internal use only. Don't call this
[167] */
[168] public function setData(Player $player, FakeMenuInventory $inv){
[169] InventoryMenuAPI::setData($player, $this, $inv, $player->getInventory()->getContents());
[170] }
[171] }

Any solution?

 

$player probably isn’t a player object, so possibly the player isn’t online