phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f3df91f496268caee3af8a7511f0dfdb' 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 ('f3df91f496268caee3af8a7511f0dfdb', -1, 1768362799, 1768362799, 'd849d868', -4, 0, 0)

Line : 187
File : sessions.php