phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO iabb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c707f5aea50747181c0718a5f1feb3d3', -1, 1560895029, 1560895029, '035482fc', 58, 0, 0)

Line : 187
File : sessions.php