phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '486b26ebb483674361ffe11e3ae55cfd' 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 ('486b26ebb483674361ffe11e3ae55cfd', -1, 1771103958, 1771103958, 'd849d800', -4, 0, 0)

Line : 187
File : sessions.php