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 ('42aae0a1b69f089eb0476f2dd8318308', -1, 1713507666, 1713507666, '030c6c07', -4, 0, 0)

Line : 187
File : sessions.php