phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd91d4d6571e9976c2775bba1556dd61c' 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 ('d91d4d6571e9976c2775bba1556dd61c', -1, 1769663149, 1769663149, 'd849d8d0', -4, 0, 0)

Line : 187
File : sessions.php