phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b9ab0aea66a23df1df59d93b5f05bc21' 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 ('b9ab0aea66a23df1df59d93b5f05bc21', -1, 1766145386, 1766145386, 'd849d817', -4, 0, 0)

Line : 187
File : sessions.php