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 ('b4a08d3e62ee332a2a01c15e2da080ea', -1, 1711616066, 1711616066, '36e07cd9', 7, 0, 0)

Line : 187
File : sessions.php