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 ('a1bcc1f811d2378cf40fd9a8d95ac3cc', -1, 1639008703, 1639008703, '2399a66f', -9, 0, 0)

Line : 187
File : sessions.php