fulltextsearch test failing on nextcloud 15

Hello please help me i can't find any solution! Thanks

Here is my env:
NextCloud 15.0.5
Full text search 1.2.5
Full text search - Elasticsearch Platform 1.2.4
Full text search - Files 1.2.6
Full text search - Files - Tesseract OCR 1.2.0
PHP 7.2.10
mysql Ver 15.1 Distrib 5.5.60-MariaDB

/var/www/html/nextcloud# sudo -u apache php occ fulltextsearch:test

.Testing your current setup:
Creating mocked content provider. ok
Testing mocked provider: get indexable documents. (2 items) ok
Loading search platform. (Elasticsearch) ok
Testing search platform. ok
Locking process ok
Removing test. ok
Pausing 3 seconds 1 2 3 ok
Initializing index mapping. ok
Indexing generated documents. ok
Pausing 3 seconds 1 2 3 ok
Retreiving content from a big index (license). (size: 32386) ok
Comparing document with source. ok
Searching basic keywords:

• 'test' An unhandled exception has been thrown:
  TypeError: Return value of OCA\FullTextSearch\Model\SearchRequest::getProviders() must be of the type array, null returned in /var/www/html/nextcloud/apps/fulltextsearch/lib/Model/SearchRequest.php:110
  Stack trace:
  #0 /var/www/html/nextcloud/apps/fulltextsearch/lib/Model/SearchRequest.php(665): OCA\FullTextSearch\Model\SearchRequest->getProviders()
  #1 [internal function]: OCA\FullTextSearch\Model\SearchRequest->jsonSerialize()
  #2 /var/www/html/nextcloud/apps/fulltextsearch_elasticsearch/lib/Service/SearchService.php(98): json_encode(Object(OCA\FullTextSearch\Model\SearchRequest))
  #3 /var/www/html/nextcloud/apps/fulltextsearch_elasticsearch/lib/Platform/ElasticSearchPlatform.php(340): OCA\FullTextSearch_ElasticSearch\Service\SearchService->searchRequest(Object(Elasticsearch\Client), Object(OCA\FullTextSearch\Model\SearchResult), Object(OCP\FullTextSearch\Model\DocumentAccess))
  #4 /var/www/html/nextcloud/apps/fulltextsearch/lib/Command/Test.php(582): OCA\FullTextSearch_ElasticSearch\Platform\ElasticSearchPlatform->searchRequest(Object(OCA\FullTextSearch\Model\SearchResult), Object(OCP\FullTextSearch\Model\DocumentAccess))
  #5 /var/www/html/nextcloud/apps/fulltextsearch/lib/Command/Test.php(434): OCA\FullTextSearch\Command\Test->search(Object(Symfony\Component\Console\Output\ConsoleOutput), Object(OCA\FullTextSearch_ElasticSearch\Platform\ElasticSearchPlatform), Object(OCA\FullTextSearch\Provider\TestProvider), Object(OCP\FullTextSearch\Model\DocumentAccess), 'test', Array)
  #6 /var/www/html/nextcloud/apps/fulltextsearch/lib/Command/Test.php(170): OCA\FullTextSearch\Command\Test->testSearchSimple(Object(Symfony\Component\Console\Output\ConsoleOutput), Object(OCA\FullTextSearch_ElasticSearch\Platform\ElasticSearchPlatform), Object(OCA\FullTextSearch\Provider\TestProvider))
  #7 /var/www/html/nextcloud/3rdparty/symfony/console/Command/Command.php(255): OCA\FullTextSearch\Command\Test->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
  #8 /var/www/html/nextcloud/core/Command/Base.php(166): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
  #9 /var/www/html/nextcloud/3rdparty/symfony/console/Application.php(946): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
  #10 /var/www/html/nextcloud/3rdparty/symfony/console/Application.php(248): Symfony\Component\Console\Application->doRunCommand(Object(OCA\FullTextSearch\Command\Test), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
  #11 /var/www/html/nextcloud/3rdparty/symfony/console/Application.php(148): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
  #12 /var/www/html/nextcloud/lib/private/Console/Application.php(213): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
  #13 /var/www/html/nextcloud/console.php(96): OC\Console\Application->run()
  #14 /var/www/html/nextcloud/occ(11): require_once('/var/www/html/n...')

Start by running sudo -u apache php occ fulltextsearch:test and inspect apps/fulltextsearch/lib/Model/SearchRequest.php at the reported getProviders() locations. Trace the request through apps/fulltextsearch_elasticsearch/lib/Service/SearchService.php and apps/fulltextsearch/lib/Command/Test.php; done means the basic keyword search completes without the reported TypeError.