Ellen DeGeneres' group selfie from the Oscars disappeared from Twitter Tuesday.
The most retweeted tweet of all time, gone.
The URL of the tweet took users to a "Sorry, that page doesn't exist" page.
Other photos from Oscar night were still up at the time, however.
Twitter said in a statement it was researching a bug causing tweets to not be visible.
"We are currently researching a bug that has caused some Tweets to not be displayed."
Update — 3/25 at 5:56 p.m. PT: The tweet is now back online.
Update — 3/26 at 11:21 a.m. PT: Twitter posted an update that the bug had been resolved.
"This issue has been resolved, and affected Tweets, along with the favorites and retweets on those Tweets, have been restored."