phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c8bcc5d3d748496bfa1edae8a66349c9' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c8bcc5d3d748496bfa1edae8a66349c9', -1, 1770510741, 1770510741, 'd849d897', -4, 0, 0)

Line : 187
File : sessions.php