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 ('93cd43e25aeac8fff22a87bab9d864df', -1, 1714018811, 1714018811, '12e11f9f', -7, 0, 0)

Line : 187
File : sessions.php