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 ('1b0f1e41f149cbf7dfb7437efa2bb2d4', -1, 1711711413, 1711711413, '0350906e', -9, 0, 0)

Line : 187
File : sessions.php