FIX BUG where items duplicate on spamming fetch and cancel
FIX BUG where items duplicate on spamming fetch and cancel

kvnbai/redux-isomorphic-spa-boilerplate-example,kvnbai/redux-isomorphic-spa-boilerplate-example,kvnbai/redux-isomorphic-spa-boilerplate-example,kvnbai/redux-isomorphic-spa-boilerplate-example