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 ('f1a2e92b7d12303ec76aa04f4a6df671', -1, 1708925701, 1708925701, '03ef0997', 0, 0, 0)

Line : 187
File : sessions.php