Assert\Assertion::isObject PHP Method

    public static function isObject($value, $message = null, $propertyPath = null)
    {
        if (!is_object($value)) {
            $message = sprintf($message ?: 'Provided "%s" is not a valid object.', static::stringify($value));
            throw static::createException($value, $message, static::INVALID_OBJECT, $propertyPath);
        }
        return true;
    }

 /**
  * @param AggregateType $aggregateType
  * @param string $aggregateId
  * @param object $aggregateRoot
  * @param int $lastVersion
  * @param DateTimeImmutable $createdAt
  */
 public function __construct(AggregateType $aggregateType, $aggregateId, $aggregateRoot, $lastVersion, DateTimeImmutable $createdAt)
 {
     Assertion::minLength($aggregateId, 1);
     Assertion::isObject($aggregateRoot);
     Assertion::min($lastVersion, 1);
     $this->aggregateType = $aggregateType;
     $this->aggregateId = $aggregateId;
     $this->aggregateRoot = $aggregateRoot;
     $this->lastVersion = $lastVersion;
     $this->createdAt = $createdAt;
 }