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Kunena version detailed: Kunena 5.1.18 | 2020-06-30 [ Rhea ]
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| Joomla! detailed language files installed:

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Joomla! languages installed:
en-GB	English (United Kingdom)
pt-BR	Português do Brasil (pt-BR)
fr-FR	French (France)

Third-party components: None

Third-party SEF components: None

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Modules: Kunena Login 5.1.2

== New topic created ==
Please do not add your questions to ancient and solved topics.

I'm sorry, but you must repair your Kunena menus. I can't see the logic in your linkings. On a multilingual website, it is especially important not to create incorrect menu items.
Remove all unneeded menu items from the trash, this can cause errors too.
Please see here:
docs.kunena.org/en/troubleshooting/menu-issues
docs.kunena.org/en/faq/kunena-menu
www.kunena.org/forum/general-questions-a...multilingual-website
www.kunena.org/forum/general-questions-a...ultilingual-web-site