phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'cb6ab349f7202da5e8b08f5348f55a7b' 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 ('cb6ab349f7202da5e8b08f5348f55a7b', -1, 1770801546, 1770801546, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php