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 ('ebd16c5466b3ec389141b4badd6bbb06', -1, 1542177890, 1542177890, '36dd4b73', -1, 0, 0)

Line : 190
File : sessions.php