phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9a15c4807fdf0521725f33f097cb55ab' 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 ('9a15c4807fdf0521725f33f097cb55ab', -1, 1767344991, 1767344991, 'd849d82e', -4, 0, 0)

Line : 187
File : sessions.php