phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'de96e4f0918e697f4cad98a1b40a1d59' 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 ('de96e4f0918e697f4cad98a1b40a1d59', -1, 1770032871, 1770032871, 'd849d837', -9, 0, 0)

Line : 187
File : sessions.php