fixing a bug of logger.
fixing a bug of logger.

creichert/wai,sordina/wai,utdemir/wai,sordina/wai,tolysz/wai,erikd/wai,erikd/wai,erikd/wai,yesodweb/wai,sordina/wai,creichert/wai,sordina/wai,frontrowed/wai,kazu-yamamoto/wai,frontrowed/wai,tolysz/wai,frontrowed/wai,tolysz/wai,utdemir/wai,tolysz/wai,erikd/wai,utdemir/wai,yesodweb/wai,kazu-yamamoto/wai,utdemir/wai,frontrowed/wai