Error importing one of the users

PDOException: SQLSTATE[HY000]: General error: 1366 Incorrect string value: '\xF0\x9F\x98\x89 R...' for column 'tweet' at row 1: INSERT INTO {twitter_import} (tweet_id, user, tweet, created, data, status, source, fid) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6, :db_insert_placeholder_7); Array ( [:db_insert_placeholder_0] => 147895251112169472 [:db_insert_placeholder_1] =>

I get the above error when importing one of the users, all the other users import fine.