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 ('e68b5435b55aa6f78756760987dc063d', -1, 1711691489, 1711691489, '36e02b4f', -7, 0, 0)

Line : 187
File : sessions.php