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 ('9e7dd8363e3cfa4be3efb393a2c32712', -1, 1711639366, 1711639366, '12eaa56b', -8, 0, 0)

Line : 187
File : sessions.php