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 ('8015fc922a42ecd2b6df5742e9ceff0f', -1, 1634633406, 1634633406, '03ef3221', 46, 0, 0)

Line : 187
File : sessions.php