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 ('0fc042310e4f4d23cef666255f8f00ef', -1, 1709164194, 1709164194, '03ec9199', -11, 0, 0)

Line : 187
File : sessions.php