phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ac687a98a4c1586c99798121adc4c8c8' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('ac687a98a4c1586c99798121adc4c8c8', -1, 1765938949, 1765938949, 'd849d8be', 5, 0, 0)

Line : 187
File : sessions.php