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 ('12008abcf68d56156907bccb67829fbe', -1, 1638381393, 1638381393, '345a316c', -4, 0, 0)

Line : 187
File : sessions.php