Steps to reproduce the issue

install clean copy of j4.
try to install blog data ( mine failed )
try to delete tag
error will be thrown.

Expected result

tags deleted

Actual result

Call stack
--
# | Function | Location
1 | () | JROOT\libraries\vendor\wamania\php-stemmer\src\StemmerFactory.php:52
2 | sprintf() | JROOT\libraries\vendor\wamania\php-stemmer\src\StemmerFactory.php:52
3 | Wamania\Snowball\StemmerFactory::create() | JROOT\administrator\components\com_finder\src\Indexer\Language.php:78
4 | Joomla\Component\Finder\Administrator\Indexer\Language->__construct() | JROOT\administrator\components\com_finder\src\Indexer\Language.php:117
5 | Joomla\Component\Finder\Administrator\Indexer\Language::getInstance() | JROOT\administrator\components\com_finder\src\Indexer\Helper.php:92
6 | Joomla\Component\Finder\Administrator\Indexer\Helper::tokenize() | JROOT\administrator\components\com_finder\src\Indexer\Indexer.php:874
7 | Joomla\Component\Finder\Administrator\Indexer\Indexer->tokenizeToDbShort() | JROOT\administrator\components\com_finder\src\Indexer\Indexer.php:844
8 | Joomla\Component\Finder\Administrator\Indexer\Indexer->tokenizeToDb() | JROOT\administrator\components\com_finder\src\Indexer\Indexer.php:419
9 | Joomla\Component\Finder\Administrator\Indexer\Indexer->index() | JROOT\plugins\finder\tags\tags.php:270
10 | PlgFinderTags->index() | JROOT\administrator\components\com_finder\src\Indexer\Adapter.php:333
11 | Joomla\Component\Finder\Administrator\Indexer\Adapter->reindex() | JROOT\administrator\components\com_finder\src\Indexer\Adapter.php:849
12 | Joomla\Component\Finder\Administrator\Indexer\Adapter->itemStateChange() | JROOT\plugins\finder\tags\tags.php:191
13 | PlgFinderTags->onFinderChangeState() | JROOT\libraries\src\Plugin\CMSPlugin.php:285
14 | Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() | JROOT\libraries\vendor\joomla\event\src\Dispatcher.php:495
15 | Joomla\Event\Dispatcher->dispatch() | JROOT\libraries\src\Application\EventAware.php:111
16 | Joomla\CMS\Application\WebApplication->triggerEvent() | JROOT\plugins\content\finder\finder.php:102
17 | PlgContentFinder->onContentChangeState() | JROOT\libraries\src\Plugin\CMSPlugin.php:285
18 | Joomla\CMS\Plugin\CMSPlugin->Joomla\CMS\Plugin\{closure}() | JROOT\libraries\vendor\joomla\event\src\Dispatcher.php:495
19 | Joomla\Event\Dispatcher->dispatch() | JROOT\libraries\src\Application\EventAware.php:111
20 | Joomla\CMS\Application\WebApplication->triggerEvent() | JROOT\libraries\src\MVC\Model\AdminModel.php:1181
21 | Joomla\CMS\MVC\Model\AdminModel->publish() | JROOT\libraries\src\MVC\Controller\AdminController.php:219
22 | Joomla\CMS\MVC\Controller\AdminController->publish() | JROOT\libraries\src\MVC\Controller\BaseController.php:729
23 | Joomla\CMS\MVC\Controller\BaseController->execute() | JROOT\libraries\src\Dispatcher\ComponentDispatcher.php:146
24 | Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() | JROOT\libraries\src\Component\ComponentHelper.php:389
25 | Joomla\CMS\Component\ComponentHelper::renderComponent() | JROOT\libraries\src\Application\AdministratorApplication.php:142
26 | Joomla\CMS\Application\AdministratorApplication->dispatch() | JROOT\libraries\src\Application\AdministratorApplication.php:185
27 | Joomla\CMS\Application\AdministratorApplication->doExecute() | JROOT\libraries\src\Application\CMSApplication.php:233
28 | Joomla\CMS\Application\CMSApplication->execute() | JROOT\administrator\includes\app.php:63
29 | require_once() | JROOT\administrator\index.php:36

System information (as much as possible)

systeminfo-2020-12-06T12_36_19-06_00.txt

Additional comments

refreshing page shows tag gone.