username say wordpress but no username named like this

im useing Threewp Activity Monitor wp Plugin.

I get some activity from user 'wordpress', 'id'=0, that logged out from (website). Have anybody know what is this activity?

i search my wp users in database also, i cannot find any username named wordpress.

http://ift.tt/Abmd9q

Thank you in advance for help.

via Chebli Mohamed