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 ('6d6e22d4a7645c06b96806fc6bf74995', -1, 1542180826, 1542180826, '36dd4b73', -2, 0, 0)

Line : 190
File : sessions.php