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 ('a91b85fc254e6dbb3dc5610dfae28318', -1, 1711615606, 1711615606, '03ec13fb', 0, 0, 0)

Line : 187
File : sessions.php