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 ('67f220f8a00f547131cd418713d02a31', -1, 1711695168, 1711695168, '36c4342d', -4, 0, 0)

Line : 187
File : sessions.php