Error after update

This error occurs when saving or posting an article, this shortly after the update

Ocorreu um erro.
0 Call to undefined method Joomla\CMS\Application\AdministratorApplication::getLanguageFilter()
Retornar ao Painel de Controle

I think of buying the pro version, but I want guarantees that these errors do not occur

Hi,
Joomla! 3.8.12
Route 66 v1.6.0

I need to verify the error, it continues even with the pro version, in my analysis it is an incompatibility with the "Content - JSitemap Pingomatic" plugin of the JSitemap Pro component, as soon as I unplug the plugin this error some.
I have another question regarding the componete, it is saving the aliase with accent and special characters, but this leads to many 404 error pages, what configuration should I change so that the plugin of yours already saves the aliase without those characters?