phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ef8a75a0062364dfa38446c5d54fe49e' 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 ('ef8a75a0062364dfa38446c5d54fe49e', -1, 1771045416, 1771045416, 'd849d88a', -4, 0, 0)

Line : 187
File : sessions.php