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 ('8282be1f1faa64eaefd3772905a535a0', -1, 1711651697, 1711651697, '12d466ae', 4, 0, 0)

Line : 187
File : sessions.php