I have users with login including this character : "#"

Then user tool try to get this url to retrieve user image :
http://localhost/_admin/plugins/core-ui/user/interne/toto#EXT#@titi/image_16

Apache consider first # like an alias and the requested url is : http://localhost/_admin/plugins/core-ui/user/interne/toto

We should encode this url to transform # by %23