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 ('fb2ae9c8acec68147a88773f6779c0c2', -1, 1711647888, 1711647888, '03eab177', -1, 0, 0)

Line : 187
File : sessions.php