phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO cantautore_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin, is_robot) VALUES ('3cea938235e5fbd4aa815cb8655546ff', -1, 1711726778, 1711726778, '035b4f86', -9, 0, '0', '0')

Line : 175
File : sessions.php