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 ('f84e3607807c23a9c41d601fc2164ca1', -1, 1711688700, 1711688700, '2cccc4a1', -1, 0, 0)

Line : 187
File : sessions.php