title: TypeError [ERR_INVALID_ARG_TYPE]
body: <p>I am trying to run my application server and i keep getting the following error back</p>
  <pre><code>TypeError [ERR_INVALID_ARG_TYPE]: The &quot;key&quot; argument must be of type string or an instance of Buffer, TypedArray, DataView, or KeyObject. Received null
  </code></pre>
  <p>am using postgres as my database and below is the content of my db config file</p>
  <pre><code>development: {
      database: 'app_dev',
      use_env_variable: 'DATABASE_URL_DEV',
      dialect: 'postgres',
    },
    test: {
      database: 'app_test',
      use_env_variable: 'DATABASE_URL_TEST',
      dialect: 'postgres',
      logging: false,
    }
  </code></pre>
  <p>here am using <code>Sequelize CLI [Node: 12.18.3, CLI: 5.5.1, ORM: 5.21.4]</code></p>