phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9adcaf329b7cc30dbb5be7796b8b3357' 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 ('9adcaf329b7cc30dbb5be7796b8b3357', -1, 1770139304, 1770139304, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php