Solarium Query set rows

After update to 8.x-3.0-beta3, I got these error message:

TypeError: Argument 1 passed to Solarium\QueryType\Select\Query\Query::setRows() must be of the type integer, null given, called in drupal\web\modules\contrib\search_api_solr\src\Plugin\search_api\backend\SearchApiSolrBackend.php on line 1247 in Solarium\QueryType\Select\Query\Query->setRows()

The code line is:
$solarium_query->setRows($query->getOption('limit', 10));

At my case $query->getOption('limit', 10) can be null. So there has to be a check if the limit is null.