How to end next post link in a specific category?

Hello mates,i am using a wordpress blog.it has many categories like vectors,textures,photos and so many.The theme is built in Previous post and Next Post,which is really good.

But The problem is,in the last Post of the First category(Vectors),The next Post is leading to Texture category Post.

Simply i don’t want that,it must not show the “Next Post” for the Last post of a specific category.How to do that?
Any help will be appreciated.