[Profiler] Explain is broken

[ssaki]

Hitting the "Explain query" link in the Doctrine's profiler screen reports "An error occurred while loading the query explanation." with request to profiler controller reporting 500 status.

It's caused by vendor/doctrine/doctrine-bundle/Controller/ProfilerController.php:102

    private function explainOtherPlatform(Connection $connection, $query)
    {
        return $connection->executeQuery('EXPLAIN '.$query['sql'], $query['params'], $query['types'])
            ->fetchAll(\PDO::FETCH_ASSOC);
    }

The second parameter of executeQuery() must be an array while $query['params'] is an instance of Symfony\Component\VarDumper\Cloner\Data.

[PaddyLock]

I'm also experiencing this issue. I have Symfony 4.1.4 with Flex.