Fulltextsearch shows error when searching on CLI, works perfectly in Web UI

My system is running Nextcloud 16.0.1 with the latest Fulltextsearch apps and Elasticsearch 7.2. I indexed everything successfully, but if I try to search anything the following error is thrown:

# sudo -u www-data php occ fulltextsearch:search user linux
search
An unhandled exception has been thrown:
TypeError: Argument 1 passed to OCA\Files_FullTextSearch\Service\FilesService::getFileFromId() must be of the type string, null given, called in /var/www/owncloud/apps/files_fulltextsearch/lib/Service/SearchService.php on line 241 and defined in /var/www/owncloud/apps/files_fulltextsearch/lib/Service/FilesService.php:432
Stack trace:
#0 /var/www/owncloud/apps/files_fulltextsearch/lib/Service/SearchService.php(241): OCA\Files_FullTextSearch\Service\FilesService->getFileFromId(NULL, 51585)
#1 /var/www/owncloud/apps/files_fulltextsearch/lib/Service/SearchService.php(219): OCA\Files_FullTextSearch\Service\SearchService->setDocumentInfo(Object(OCA\Files_FullTextSearch\Model\FilesDocument))
#2 /var/www/owncloud/apps/files_fulltextsearch/lib/Provider/FilesProvider.php(330): OCA\Files_FullTextSearch\Service\SearchService->improveSearchResult(Object(OCA\FullTextSearch\Model\SearchResult))
#3 /var/www/owncloud/apps/fulltextsearch/lib/Service/SearchService.php(205): OCA\Files_FullTextSearch\Provider\FilesProvider->improveSearchResult(Object(OCA\FullTextSearch\Model\SearchResult))
#4 /var/www/owncloud/apps/fulltextsearch/lib/Service/SearchService.php(161): OCA\FullTextSearch\Service\SearchService->searchFromProviders(Object(OCA\FullTextSearch_ElasticSearch\Platform\ElasticSearchPlatform), Array, Object(OC\FullTextSearch\Model\DocumentAccess), Object(OCA\FullTextSearch\Model\SearchRequest))
#5 /var/www/owncloud/apps/fulltextsearch/lib/Command/Search.php(109): OCA\FullTextSearch\Service\SearchService->search('alfred', Object(OCA\FullTextSearch\Model\SearchRequest))
#6 /var/www/owncloud/3rdparty/symfony/console/Command/Command.php(255): OCA\FullTextSearch\Command\Search->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#7 /var/www/owncloud/core/Command/Base.php(166): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#8 /var/www/owncloud/3rdparty/symfony/console/Application.php(901): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#9 /var/www/owncloud/3rdparty/symfony/console/Application.php(262): Symfony\Component\Console\Application->doRunCommand(Object(OCA\FullTextSearch\Command\Search), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#10 /var/www/owncloud/3rdparty/symfony/console/Application.php(145): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#11 /var/www/owncloud/lib/private/Console/Application.php(213): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#12 /var/www/owncloud/console.php(97): OC\Console\Application->run()
#13 /var/www/owncloud/occ(11): require_once('/var/www/ownclo...')

I am also getting this if I run the command without any arguments:

sudo -u www-data php occ fulltextsearch:search
search
An unhandled exception has been thrown:
TypeError: Argument 1 passed to OCA\FullTextSearch\Service\SearchService::search() must be of the type string, null given, called in /var/www/owncloud/apps/fulltextsearch/lib/Command/Search.php on line 109 and defined in /var/www/owncloud/apps/fulltextsearch/lib/Service/SearchService.php:139
Stack trace:
#0 /var/www/owncloud/apps/fulltextsearch/lib/Command/Search.php(109): OCA\FullTextSearch\Service\SearchService->search(NULL, Object(OCA\FullTextSearch\Model\SearchRequest))
#1 /var/www/owncloud/3rdparty/symfony/console/Command/Command.php(255): OCA\FullTextSearch\Command\Search->execute(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#2 /var/www/owncloud/core/Command/Base.php(166): Symfony\Component\Console\Command\Command->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#3 /var/www/owncloud/3rdparty/symfony/console/Application.php(901): OC\Core\Command\Base->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#4 /var/www/owncloud/3rdparty/symfony/console/Application.php(262): Symfony\Component\Console\Application->doRunCommand(Object(OCA\FullTextSearch\Command\Search), Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#5 /var/www/owncloud/3rdparty/symfony/console/Application.php(145): Symfony\Component\Console\Application->doRun(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#6 /var/www/owncloud/lib/private/Console/Application.php(213): Symfony\Component\Console\Application->run(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\Component\Console\Output\ConsoleOutput))
#7 /var/www/owncloud/console.php(97): OC\Console\Application->run()
#8 /var/www/owncloud/occ(11): require_once('/var/www/ownclo...')

Interestingly, the search using the Web UI works perfectly fine without any errors.

Start with apps/fulltextsearch/lib/Command/Search.php and compare its argument handling with the web search path. Then inspect apps/fulltextsearch/lib/Service/SearchService.php and apps/files_fulltextsearch/lib/Service/FilesService.php around the reported lines, reproduce both CLI commands, and confirm that missing arguments and search results no longer produce TypeErrors.