phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a99d1ac0e70eefac9e16d63f843315e9' 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 ('a99d1ac0e70eefac9e16d63f843315e9', -1, 1770141680, 1770141680, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php