docker run error: Application error: a client-side exception has occurred (see the browser console for more information).

[alexhmyang]

backend-1 | INFO: 127.0.0.1:55984 - "GET /status HTTP/1.1" 200 OK
backend-1 | INFO: 127.0.0.1:53802 - "GET /status HTTP/1.1" 200 OK
backend-1 | INFO: 172.18.0.2:58296 - "GET /characters HTTP/1.1" 500 Internal Server Error
web-1 | getCharacters: got undefined characters
backend-1 | INFO: 172.18.0.2:58296 - "GET /characters HTTP/1.1" 500 Internal Server Error
web-1 | getCharacters: got undefined characters