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 ('57e00ef853df0f8e1a406412f94f1f0e', -1, 1711694994, 1711694994, '36936e2f', -11, 0, 0)

Line : 187
File : sessions.php