TeamSpeak TypeError: XF\Language::getEffectivePhraseName(): Argument #1 ($name) must be of type string, null given, called in src\XF\Language.php on line 112

[SeToY]

#0 src\XF\Language.php(112): XF\Language->getEffectivePhraseName(NULL)
#1 src\XF.php(1105): XF\Language->phrase(NULL, Array, true, true)
#2 src\addons\NF\TeamSpeak\XF\Pub\Controller\AccountController.php(155): XF::phrase(NULL)
#3 src\XF\Mvc\Dispatcher.php(362): NF\TeamSpeak\XF\Pub\Controller\AccountController->actionTeamSpeakSync(Object(XF\Mvc\ParameterBag))
#4 src\XF\Mvc\Dispatcher.php(264): XF\Mvc\Dispatcher->dispatchClass('XF:Account', 'TeamspeakSync', Object(XF\Mvc\RouteMatch), Object(SV\SearchImprovements\XF\Pub\Controller\Account), NULL)
#5 src\XF\Mvc\Dispatcher.php(121): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(SV\SearchImprovements\XF\Pub\Controller\Account), NULL)
#6 src\XF\Mvc\Dispatcher.php(63): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#7 src\XF\App.php(2826): XF\Mvc\Dispatcher->run()
#8 src\XF.php(806): XF\App->run()
#9 index.php(23): XF::runApp('XF\\Pub\\App')
#10 {main}