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 ('bc955e7b75b3cc49f39a9a6b3de61d5a', -1, 1711699639, 1711699639, '36a68d34', -4, 0, 0)

Line : 187
File : sessions.php