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 ('570b13fd72c5fb7f1d6ecff7ee5685b7', -1, 1560895089, 1560895089, '035482fc', -9, 0, 0)

Line : 187
File : sessions.php