phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4ad23d9c54b7c5baddab3d6ea51a4f01' 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 ('4ad23d9c54b7c5baddab3d6ea51a4f01', -1, 1768064685, 1768064685, 'd849d8a4', -4, 0, 0)

Line : 215
File : sessions.php