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 ('d9904128fbb3b6328a086a61dd26d67f', -1, 1711622445, 1711622445, '641a8cb3', -4, 0, 0)

Line : 187
File : sessions.php