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 ('047976dd1e6a6e49034f6f3c9ebb32f5', -1, 1711710354, 1711710354, '2cc93b14', -4, 0, 0)

Line : 187
File : sessions.php