phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b8d357a9eea24ee3e33bd8047e3dec1f' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('b8d357a9eea24ee3e33bd8047e3dec1f', -1, 1770240445, 1770240445, 'd849d877', 0, 0, 0, '0')

Line : 187
File : sessions.php