NullReferenceException on StartVote

hi,
i got an "NullReferenceException: Object reference not set to an instance of an object" Error if the MapVoter Plugin tries to start a vote.
Do you have a quick idea and solution?
Unfortunately none of the logs provide any more information.

I also sent this to you via Discord PM in the hope that you'll see it sooner that way.

Version 1.4.77 / Download 1.4.78 - Non Dedicated Servers (both with permission and without permission)

check if one of settings in the config file is null.

For me this was null
"Generate custom maps": {
      "Generate Custom map": false,

Error found:
"RustMaps ORG ID": null,
Must be like this:
"RustMaps ORG ID": "",

Thanks for the quick help via Discord!!!!!