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 ('81076ac233b0b0b47d052eb2c2bc5faf', -1, 1711626714, 1711626714, '12d13f78', -4, 0, 0)

Line : 187
File : sessions.php