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 ('d236d40e32130478f07f1479790acfe8', -1, 1711708845, 1711708845, '03ecf030', -4, 0, 0)

Line : 187
File : sessions.php