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 ('ce2c026f828bd0d9eec799918556d34a', -1, 1711658979, 1711658979, '0353575e', -8, 0, 0)

Line : 187
File : sessions.php