phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '0c54a2477e8e0bc505551eb158266556' 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 ('0c54a2477e8e0bc505551eb158266556', -1, 1771200973, 1771200973, 'd849d800', -4, 0, 0)

Line : 187
File : sessions.php