phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c6a2084321cbd3b6d1c3709fa286ad8c', -1, 1711655692, 1711655692, '0353512a', -8, 0, 0)

Line : 187
File : sessions.php