Crashes when specifies same argument more than once

[prateek2468]

scioer-builder -w --wiki-git-repo=https://github.com/sci-oer/c-resource.git    

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))': /
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', RemoteDisconnected('Remote end closed connection without response'))': /
WARNING: Syncing all the wiki content from the git repository, this may take a while...
ERROR: {
  "data": {
    "storage": {
      "executeAction": {
        "responseResult": {
          "succeeded": false,
          "errorCode": 1,
          "slug": "Error",
          "message": "fatal: ambiguous argument 'main': unknown revision or path not in the working tree.\nUse '--' to separate paths from revisions, like this:\n'git <command> [<revision>...] -- [<file>...]'\n"
        }
      }
    }
  }
}
Exception: Query failed to run with a 200.