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 ('0f6bd8b23e6368c3a76fc7fee7dec095', -1, 1711663904, 1711663904, '36c41b7a', -4, 0, 0)

Line : 187
File : sessions.php