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 ('e10cf306bd9632ddc5fd0e8e44d5d2bd', -1, 1711647164, 1711647164, '34cd9f30', -1, 0, 0)

Line : 187
File : sessions.php