CSRF token is missing error in docker pgadmin

I am trying to create a docker-compose stack with pg and pgadmin as follows,

version: '3.1'
services:
  pg-admin:
    image: dpage/pgadmin4
    volumes:
        - /Users/pkaramol/Desktop/backup.tar:/pgadmin4/dvdrental.tar
    ports:
      - "8181:80"
    environment:
      PGADMIN_DEFAULT_EMAIL: user@domain.com
      PGADMIN_DEFAULT_PASSWORD: 1234
    depends_on:
    - pg
  pg:
    image: postgres:12
    volumes:
      - ./pg-data:/var/lib/postgresql/data
    environment:
      POSTGRES_DB: postgres
      POSTGRES_USER: postgres
      POSTGRES_PASSWORD: postgres
    restart: always

but pgadmin logs error out as follows:

pg-admin_1  | Traceback (most recent call last):
pg-admin_1  |   File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 1811, in full_dispatch_request
pg-admin_1  |     rv = self.preprocess_request()
pg-admin_1  |   File "/usr/local/lib/python3.8/site-packages/flask/app.py", line 2087, in preprocess_request
pg-admin_1  |     rv = func()
pg-admin_1  |   File "/usr/local/lib/python3.8/site-packages/flask_wtf/csrf.py", line 224, in csrf_protect
pg-admin_1  |     self.protect()
pg-admin_1  |   File "/usr/local/lib/python3.8/site-packages/flask_wtf/csrf.py", line 259, in protect
pg-admin_1  |     self._error_response(e.args[0])
pg-admin_1  |   File "/usr/local/lib/python3.8/site-packages/flask_wtf/csrf.py", line 302, in _error_response
pg-admin_1  |     raise CSRFError(reason)
pg-admin_1  | flask_wtf.csrf.CSRFError: 400 Bad Request: The CSRF session token is missing.

Any suggestions?