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 ('1d3182003910a53e3bc444b42863bba4', -1, 1553222003, 1553222003, '36c4d0bb', -2, 0, 0)

Line : 187
File : sessions.php