[FIXED] Search index rebuild error

[janslu]

I have finally upgraded to XF 2.0, and I have encountered an error when recreating search index. I am using XF Enhanced Search. Here's the error:

Server error log
ErrorException: [E_WARNING] Illegal string offset 'tag' src/XF/Search/IndexRecord.php:69
Wygenerowane przez: janslu 22 Grudzień 2018 o 16:18
Stack trace
#0 src/XF/Search/IndexRecord.php(69): XF::handlePhpError(2, '[E_WARNING] Ill...', '/var/www/hosts/...', 69, Array)
#1 src/addons/Truonglv/Groups/Search/Data/Group.php(62): XF\Search\IndexRecord->indexTags(Array)
#2 src/XF/Search/Search.php(37): Truonglv\Groups\Search\Data\Group->getIndexData(Object(Truonglv\Groups\Entity\Group))
#3 src/XF/Search/Search.php(59): XF\Search\Search->index('tl_group', Object(Truonglv\Groups\Entity\Group))
#4 src/XF/Search/Search.php(85): XF\Search\Search->indexEntities('tl_group', Object(XF\Mvc\Entity\ArrayCollection))
#5 src/XF/Job/SearchRebuild.php(57): XF\Search\Search->indexRange('tl_group', 500, 500)
#6 src/XF/Job/Manager.php(241): XF\Job\SearchRebuild->run(G)
#7 src/XF/Job/Manager.php(187): XF\Job\Manager->runJobInternal(Array, G)
#8 src/XF/Job/Manager.php(76): XF\Job\Manager->runJobEntry(Array, G)
#9 src/XF/Admin/Controller/Tools.php(139): XF\Job\Manager->runQueue(true, 8)
#10 src/XF/Mvc/Dispatcher.php(249): XF\Admin\Controller\Tools->actionRunJob(Object(XF\Mvc\ParameterBag))
#11 src/XF/Mvc/Dispatcher.php(88): XF\Mvc\Dispatcher->dispatchClass('XF:Tools', 'RunJob', 'html', Object(XF\Mvc\ParameterBag), 'tools', Object(ThemeHouse\QAForums\XF\Admin\Controller\Tools), NULL)
#12 src/XF/Mvc/Dispatcher.php(41): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#13 src/XF/App.php(1934): XF\Mvc\Dispatcher->run()
#14 src/XF.php(333): XF\App->run()
#15 admin.php(13): XF::runApp('XF\\Admin\\App')
#16 {main}
Request state
array(4) {
  ["url"] => string(30) "/forum/admin.php?tools/run-job"
  ["referrer"] => string(53) "https://www.babyboom.pl/forum/admin.php?tools/run-job"
  ["_GET"] => array(1) {
    ["tools/run-job"] => string(0) ""
  }
  ["_POST"] => array(3) {
    ["_xfRedirect"] => string(39) "https://www.babyboom.pl/forum/admin.php"
    ["_xfToken"] => string(8) "********"
    ["only_ids"] => string(0) ""
  }
}