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 ('c4e24edd4714548e281b38817e17de9d', -1, 1711717831, 1711717831, '0358b964', -7, 0, 0)

Line : 187
File : sessions.php