phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4750de9e83f73543d1f9d67a26c8e768' 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 ('4750de9e83f73543d1f9d67a26c8e768', -1, 1768457170, 1768457170, 'd849d868', -4, 0, 0)

Line : 187
File : sessions.php