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 ('56a1a3040014c75b0d03eb5a155165fd', -1, 1714006711, 1714006711, '0390248d', -4, 0, 0)

Line : 187
File : sessions.php