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 ('9a8d2ed69e2f7aa1a7f6cdd0155c6898', -1, 1711714577, 1711714577, '2cdc3bec', -4, 0, 0)

Line : 187
File : sessions.php