phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO docttorrdiscluc_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('404fad94f116f66d0dc24ca00e2e974c', -1, 1544592389, 1544592389, '345bb931', -4, 0, 0)

Line : 190
File : sessions.php