#0 src/XF/Db/SchemaManager.php(228): XF\Db\Schema\Alter->__construct(Object(XF\Db\Mysqli\Adapter), Object(XF\Db\SchemaManager), 'xf_xa_sc_item_u...')
#1 src/XF/Db/SchemaManager.php(149): XF\Db\SchemaManager->newAlter('xf_xa_sc_item_u...')
#2 src/addons/FF/ShowcaseEnhancements/Setup.php(29): XF\Db\SchemaManager->alterTable('xf_xa_sc_item_u...', Object(Closure))
#3 src/XF/AddOn/StepRunnerInstallTrait.php(62): FF\ShowcaseEnhancements\Setup->installStep1(Array)
#4 src/XF/AddOn/StepRunnerInstallTrait.php(29): FF\ShowcaseEnhancements\Setup->installStepRunner(1, Array)
#5 src/XF/Job/AddOnInstallBatch.php(295): FF\ShowcaseEnhancements\Setup->install(Array)
#6 src/XF/Job/AddOnInstallBatch.php(91): XF\Job\AddOnInstallBatch->stepAction(Object(XF\Timer))
#7 src/XF/Job/Manager.php(260): XF\Job\AddOnInstallBatch->run(8)
#8 src/XF/Job/Manager.php(202): XF\Job\Manager->runJobInternal(Array, 8)
#9 src/XF/Job/Manager.php(118): XF\Job\Manager->runJobEntry(Array, 8)
#10 src/XF/Admin/Controller/Tools.php(122): XF\Job\Manager->runByIds(Array, 8)
#11 src/XF/Mvc/Dispatcher.php(352): XF\Admin\Controller\Tools->actionRunJob(Object(XF\Mvc\ParameterBag))
#12 src/XF/Mvc/Dispatcher.php(259): XF\Mvc\Dispatcher->dispatchClass('XF:Tools', 'RunJob', Object(XF\Mvc\RouteMatch), Object(EWR\Member\Admin\Controller\Tools), NULL)
#13 src/XF/Mvc/Dispatcher.php(115): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(EWR\Member\Admin\Controller\Tools), NULL)
#14 src/XF/Mvc/Dispatcher.php(57): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#15 src/XF/App.php(2483): XF\Mvc\Dispatcher->run()
#16 src/XF.php(524): XF\App->run()
#17 admin.php(13): XF::runApp('XF\\Admin\\App')
#18 {main}