Solved Call to a member function getEffectLevel() on null

Code:

Server thread/CRITICAL Error: "Call to a member function getEffectLevel() on null" (EXCEPTION) in "plugins/1MMORPG/src/minijaham/MMORPG/EventListener" at line 108
30.10 17:10:32 [Server] Server thread/CRITICAL #0 src/pocketmine/plugin/MethodEventExecutor(42): minijaham\MMORPG\EventListener->shootBow(object pocketmine\event\entity\EntityShootBowEvent)
30.10 17:10:32 [Server] Server thread/CRITICAL #1 src/pocketmine/plugin/RegisteredListener(80): pocketmine\plugin\MethodEventExecutor->execute(object minijaham\MMORPG\EventListener, object pocketmine\event\entity\EntityShootBowEvent)

Full code:

PHP:

public function shootBow(EntityShootBowEvent $event) {
        $player = $event->getEntity();
        $effect = Effect::SLOWNESS;
        if ($player instanceof Player){
            if ($player->getEffect($effect)->getEffectLevel() === 0) {
                $amount = 8;
                $anglesBetweenArrows = (45 / ($amount - 1)) * M_PI / 180;
                $pitch = ($player->pitch + 90) * M_PI / 180;
                $yaw = ($player->yaw + 90 - 45 / 2) * M_PI / 180;
                /** @var Projectile $projectile */
                $projectile = $event->getProjectile();
                    for ($i = 0; $i < $amount; $i++) {
                    $class = get_class($projectile);
                    $entityType = substr($class, strrpos($class, "\\") + 1);
                    $nbt = Entity::createBaseNBT($player->add(0, $player->getEyeHeight()), $player->getDirectionVector(), $player->yaw, $player->pitch);
                    /** @var Projectile $newProjectile */
                    $newProjectile = Entity::createEntity($entityType, $player->getLevel(), $nbt, $player, $projectile);
                    if ($newProjectile instanceof Arrow) $newProjectile->setPickupMode(Arrow::PICKUP_NONE);
                    $newProjectile->spawnToAll();
                    ProjectileTracker::addProjectile($newProjectile, $item);

                    $newDirection = new Vector3(sin($pitch) * cos($yaw + $anglesBetweenArrows * $i), cos($pitch), sin($pitch) * sin($yaw + $anglesBetweenArrows * $i));
                    $newProjectile->setMotion($newDirection->normalize()->multiply($projectile->getMotion()->multiply($event->getForce())->length()));
                    if ($projectile->isOnFire()) $newProjectile->setOnFire($projectile->getFireTicks() / 20);
                }
                ProjectileTracker::removeProjectile($projectile);
                $projectile->close();
            }
        }
    }

Error line:

PHP:

if ($player->getEffect($effect)->getEffectLevel() === 0) {

 

How do I solve this problem?

 

The error means that there are no getEffectLevel() function on the Effect class... The function is only callable on EffectInstance class... But I don't know how to get the EffectInstance of an effect... You can check the pocketmine source code for more information...

 

$player->getEffect($effect) may return either EffectInstance (if the player has $effect) or null (if they don't have $effect).
Assign it to a variable, check if it's null before proceeding further.

 

Omg it's Muqsit DDDD hiii(also thank you for your reply )