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 ('03f81b1cdf556eccea7d7fa53437adff', -1, 1709525559, 1709525559, '03ed2215', -1, 0, 0)

Line : 187
File : sessions.php