Issue: count(): Parameter must be an array or an object that implements Countable

When rebuildign tags:

ErrorException: count(): Parameter must be an array or an object that implements Countable - vault/core/controller/dm/item/island/vw.php:44
Generated By: Alfa, 3 minutes ago

Stack Trace
#0 /vault/core/controller/dm/item/island/vw.php(44): XenForo_Application::handlePhpError(2, 'count(): Parame...', '/home/nginx/dom...', 44, Array)
#1 /library/vw/XenForo/DataWriter.php(512): vw_DM_Item_Island_Controller->pre_save(true)
#2 /library/XenForo/DataWriter.php(1460): vw_XenForo_DataWriter->_preSave()
#3 /library/vw/XenForo/DataWriter.php(192): XenForo_DataWriter->preSave()
#4 /vault/core/controller/dm/xf.php(402): vw_XenForo_DataWriter->preSaveWithReturn()
#5 /vault/core/controller/dm/page/vw.php(2486): vw_DM_Controller_XF->pre_save(true)
#6 /vault/core/controller/dm/page/vw.php(744): vw_DM_Page_Controller->internal_pre_save(Object(vw_DM_Controller_XF), true)
#7 /library/vw/XenForo/DataWriter.php(512): vw_DM_Page_Controller->pre_save(true)
#8 /library/XenForo/DataWriter.php(1460): vw_XenForo_DataWriter->_preSave()
#9 /library/vw/XenForo/DataWriter.php(192): XenForo_DataWriter->preSave()
#10 /vault/core/controller/dm/xf.php(402): vw_XenForo_DataWriter->preSaveWithReturn()
#11 /library/vw/XenForo/DataWriter.php(187): vw_DM_Controller_XF->pre_save()
#12 /library/XenForo/DataWriter.php(1399): vw_XenForo_DataWriter->preSave()
#13 /vault/core/controller/dm/xf.php(436): XenForo_DataWriter->save()
#14 /library/vw/XenForo/TagHandler/vwPage.php(87): vw_DM_Controller_XF->save()
#15 /library/XenForo/Model/Tag.php(570): vw_XenForo_TagHandler_vwPage->updateContentTagCache(Array, Array)
#16 /library/XenForo/Deferred/TagRecache.php(50): XenForo_Model_Tag->rebuildTagCache('vwpage', 403)
#17 /library/XenForo/Model/Deferred.php(295): XenForo_Deferred_TagRecache->execute(Array, Array, 5.1881859302521, 'Rebuilding... T...')
#18 /library/XenForo/Model/Deferred.php(429): XenForo_Model_Deferred->runDeferred(Array, 5.1881859302521, 'Rebuilding... T...', false)
#19 /library/XenForo/Model/Deferred.php(374): XenForo_Model_Deferred->_runInternal(Array, 8, 'Rebuilding... T...', false)
#20 /library/XenForo/ControllerAdmin/Tools.php(159): XenForo_Model_Deferred->run(true, NULL, 'Rebuilding... T...', false)
#21 /library/XenForo/FrontController.php(369): XenForo_ControllerAdmin_Tools->actionRunDeferred()
#22 /library/XenForo/FrontController.php(152): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#23 /admin.php(13): XenForo_FrontController->run()
#24 {main}
Request State
array(3) {
["url"] => string(52) "https://my-forum.com/admin.php?tools/run-deferred"
["_GET"] => array(1) {
["tools/run-deferred"] => string(0) ""
}
["_POST"] => array(3) {
["redirect"] => string(57) "https://my-forum.com/admin.php?tools/rebuild&success=1"
["execute"] => string(1) "1"
["_xfToken"] => string(8) "********"
}
}