Hello, thanks for your response. Well, the web existed flawlessly for more than 2 years, this category issue started 2 days ago. There was no need to install additional plugins in order to remove category base untill now. So installing them is not the solution unless there is no other way. I have no Yoast SEO installed, I deactivated all plugins, only temporarilly deactivating Polylang did the trick. So please, investigate it.
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This reply was modified 2 years, 6 months ago by gorg01.