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 ('9ad787b58079586a5a3a0d7b998561ab', -1, 1714040846, 1714040846, '038fe428', -4, 0, 0)

Line : 187
File : sessions.php