phpBB by Przemo : 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 ('dd0c764faef0f4b4c1676494e4facad4', -1, 1539760563, 1539760563, '36c6d41e', -2, 0, 0)

Line : 445
File : sessions.php