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 ('3f2b012e1b58263c18e528c6056d2ae3', -1, 1635440132, 1635440132, '03ece863', -4, 0, 0)

Line : 187
File : sessions.php