Errors when changing Username in members.

Fatal error: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'lastPoster' in 'field list'
Information:
id: 66079fff422ba6d86479310d6bfd6098474ff539
error message: SQLSTATE[42S22]: Column not found: 1054 Unknown column 'lastPoster' in 'field list'
error code: 42
sql type: wcf\system\database\MySQLDatabase
sql error: Unknown column 'lastPoster' in 'field list'
sql error number: 42S22
sql version: 5.5.5-10.1.12-MariaDB
sql query: UPDATE wpbt1_issue SET lastPoster = ? WHERE lastPosterID = ?
file: /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/database/Database.class.php (231)
php version: 5.6.16
wcf version: 2.1.9 pl 1 (Typhoon)
date: Sun, 13 Mar 2016 18:31:54 +0000
request: /community/acp/index.php?user-edit/10199/&
referer: https://xiaomi-miui.gr/community/acp/index.php?user-edit/10199-Tackeberry/&
Stacktrace:
#0 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/bugtracker/lib/system/event/listener/UserActionRenameListener.class.php(39): wcf\system\database\Database->prepareStatement('UPDATE\twpbt1_is...')
#1 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/event/EventHandler.class.php(214): wpbt\system\event\listener\UserActionRenameListener->execute(Object(wcf\data\user\UserAction), 'wcf\\data\\user\\U...', 'rename', Array)
#2 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/data/user/UserAction.class.php(390): wcf\system\event\EventHandler->fireAction(Object(wcf\data\user\UserAction), 'rename')
#3 [internal function]: wcf\data\user\UserAction->update()
#4 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/data/AbstractDatabaseObjectAction.class.php(196): call_user_func(Array)
#5 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/acp/form/UserEditForm.class.php(346): wcf\data\AbstractDatabaseObjectAction->executeAction()
#6 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/form/AbstractForm.class.php(63): wcf\acp\form\UserEditForm->save()
#7 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/form/AbstractForm.class.php(114): wcf\form\AbstractForm->submit()
#8 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/acp/form/AbstractOptionListForm.class.php(100): wcf\form\AbstractForm->readData()
#9 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/acp/form/UserAddForm.class.php(370): wcf\acp\form\AbstractOptionListForm->readData()
#10 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/acp/form/UserEditForm.class.php(169): wcf\acp\form\UserAddForm->readData()
#11 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/page/AbstractPage.class.php(273): wcf\acp\form\UserEditForm->readData()
#12 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/acp/form/UserAddForm.class.php(421): wcf\page\AbstractPage->show()
#13 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/page/AbstractPage.class.php(100): wcf\acp\form\UserAddForm->show()
#14 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()
#15 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()
#16 /var/www/vhosts/xiaomi-miui.gr/xiaomi-miui.gr/community/acp/index.php(10): wcf\system\request\RequestHandler->handle('wbb', true)
#17 {main}