Username of deleted user still shows in thread starters

[محروم.كوم]

Hello,

Recently I deleted a user's profile, and the posts, but kept the threads the user had started.


Now the threads show up with the username and then "Guest" below it. I realise I need to remove the username manually from the posts in the database, since the user profile is gone, so how do I go about doing that? __DEFINE_LIKE_SHARE__