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 ('ff7f187582b7566b3f09a288e8ca17f1', -1, 1713242672, 1713242672, '03859357', -9, 0, 0)

Line : 187
File : sessions.php