error when you do /id

[tigre96]

[03:46:26] [Server thread/CRITICAL]: ErrorException: "stripos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior" (EXCEPTION) in "plugins/ChestShop/src/ChestShop/ChestShop" at line 27
[03:46:26] [Server thread/DEBUG]: #0 (): pocketmine\utils\Utils::errorExceptionHandler(integer 8192, string[135] stripos(): Non-string needles will be interpreted as strings in the future. Use , string[56] /root/Test/plugins/ChestShop/src/ChestShop/ChestShop.php, integer 27, array[7])
[03:46:26] [Server thread/DEBUG]: #1 plugins/ChestShop/src/ChestShop/ChestShop(27): stripos(string[11] IRON_SHOVEL, NULL )
[03:46:26] [Server thread/DEBUG]: #2 src/pocketmine/command/PluginCommand(58): ChestShop\ChestShop->onCommand(object pocketmine\Player, object pocketmine\command\PluginCommand, string[2] id, array[0])
[03:46:26] [Server thread/DEBUG]: #3 src/pocketmine/command/SimpleCommandMap(270): pocketmine\command\PluginCommand->execute(object pocketmine\Player, string[2] id, array[0])
[03:46:26] [Server thread/DEBUG]: #4 src/pocketmine/Server(2029): pocketmine\command\SimpleCommandMap->dispatch(object pocketmine\Player, string[2] id)
[03:46:26] [Server thread/DEBUG]: #5 src/pocketmine/Player(2231): pocketmine\Server->dispatchCommand(object pocketmine\Player, string[2] id)
[03:46:26] [Server thread/DEBUG]: #6 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(240): pocketmine\Player->chat(string[3] /id)
[03:46:26] [Server thread/DEBUG]: #7 src/pocketmine/network/mcpe/protocol/CommandRequestPacket(54): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleCommandRequest(object pocketmine\network\mcpe\protocol\CommandRequestPacket)
[03:46:26] [Server thread/DEBUG]: #8 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\CommandRequestPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[03:46:26] [Server thread/DEBUG]: #9 src/pocketmine/network/mcpe/protocol/BatchPacket(123): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\CommandRequestPacket)
[03:46:26] [Server thread/DEBUG]: #10 src/pocketmine/network/mcpe/PlayerNetworkSessionAdapter(110): pocketmine\network\mcpe\protocol\BatchPacket->handle(object pocketmine\network\mcpe\PlayerNetworkSessionAdapter)
[03:46:26] [Server thread/DEBUG]: #11 src/pocketmine/Player(3124): pocketmine\network\mcpe\PlayerNetworkSessionAdapter->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[03:46:26] [Server thread/DEBUG]: #12 src/pocketmine/network/mcpe/RakLibInterface(169): pocketmine\Player->handleDataPacket(object pocketmine\network\mcpe\protocol\BatchPacket)
[03:46:26] [Server thread/DEBUG]: #13 vendor/pocketmine/raklib/src/server/ServerHandler(99): pocketmine\network\mcpe\RakLibInterface->handleEncapsulated(string[19] 79.12.240.234 59735, object raklib\protocol\EncapsulatedPacket, integer 0)
[03:46:26] [Server thread/DEBUG]: #14 src/pocketmine/network/mcpe/RakLibInterface(109): raklib\server\ServerHandler->handlePacket()
[03:46:26] [Server thread/DEBUG]: #15 src/pocketmine/network/mcpe/RakLibInterface(99): pocketmine\network\mcpe\RakLibInterface->process()
[03:46:26] [Server thread/DEBUG]: #16 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\network\mcpe\RakLibInterface->pocketmine\network\mcpe\{closure}()
[03:46:26] [Server thread/DEBUG]: #17 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
[03:46:26] [Server thread/DEBUG]: #18 src/pocketmine/Server(2348): pocketmine\snooze\SleeperHandler->sleepUntil(double 1563500786.2122)
[03:46:26] [Server thread/DEBUG]: #19 src/pocketmine/Server(2205): pocketmine\Server->tickProcessor()
[03:46:26] [Server thread/DEBUG]: #20 src/pocketmine/Server(1784): pocketmine\Server->start()
[03:46:26] [Server thread/DEBUG]: #21 src/pocketmine/PocketMine(274): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[11] /root/Test/, string[19] /root/Test/plugins/)
[03:46:26] [Server thread/DEBUG]: #22 (1): require(string[66] phar:///root/Test/PocketMine-MP.phar/src/pocketmine/PocketMine.php)

this error is found by doing /id on any item