can you please create a dummy map file when you do a new update. it seems everytime an update is applied you would have to go to settings and save it again as it does not have access to the map file. If for some reason you don't resave the setting (since you didn't know an update will delete the file) to create the map file... your nginx will never start since it can't locate the map file as it's deleted when you update the nginx plugin.
Sorry for delayed reply.
Posted your issue on GitHub - https://github.com/rtCamp/nginx-helper/issues/35
We will try to fix it in free time.
In meanwhile, if you find a patch, then feel free to send us a pull-request on https://github.com/rtCamp/nginx-helper/