Jekyll-seo-tag and jekyll-paginate in conflict throwing Liquid Exception: no implicit conversion of nil into String (TypeError)

Cannot generate the site on Jekyll. There seems to be a problem with pagination: The jekyll-paginate gem may be causing some of the pages to not have a title. I paginate blog/index.html . If I have 5 post, everything is OK, when I add the sixth post it crashes… What is the reason?