SEF problem can acces with blog or blog/ url

Hello there,

it is not a big problem but it is not good for SEO !
On Eaasyblog i don' use SH404 i use Joomla router but the problem is that you can access to the blog with this 2 urls


I try to solve this by use a 301 redirect but this don't work.

I think this is a problem for search engine because this is considered as duplicate content.

Thanks