Problem building addon "RPi RF Receiver" - [aiohttp.server] Error handling request

Hi Forum!
Today I tried to install the rf Receiver addon from: https://github.com/pantomax/hassio-addons.git to my hass.io setup on a Raspi3…

Everything went fine, but in the middle of the install process my browser crashed, and it seems like the build process crashed, too.

Now, after that I am not able to start over. Every time i try to start setup, it fails with this log error:

INFO (SyncWorker_0) [hassio.docker.addon] Start build b34bcc76/armhf-addon-rfreceiver:1.5
ERROR (MainThread) [aiohttp.server] Error handling request
Traceback (most recent call last):
File “/usr/lib/python3.6/site-packages/aiohttp/web_protocol.py”, line 416, in start
resp = yield from self._request_handler(request)
File “/usr/lib/python3.6/site-packages/aiohttp/web.py”, line 325, in _handle
resp = yield from handler(request)
File “/usr/lib/python3.6/site-packages/aiohttp/web_middlewares.py”, line 93, in impl
return (yield from handler(request))
File “/usr/lib/python3.6/site-packages/hassio/api/security.py”, line 34, in security_layer
return await handler(request)
File “/usr/lib/python3.6/site-packages/hassio/api/utils.py”, line 33, in wrap_api
answer = await method(api, *args, **kwargs)
File “/usr/lib/python3.6/site-packages/hassio/addons/addon.py”, line 554, in install
if not await self.instance.install(self.last_version):
File “/usr/lib/python3.6/site-packages/hassio/docker/utils.py”, line 18, in wrap_api
return await method(api, *args, **kwargs)
File “/usr/lib/python3.6/concurrent/futures/thread.py”, line 56, in run
result = self.fn(*self.args, **self.kwargs)
File “/usr/lib/python3.6/site-packages/hassio/docker/addon.py”, line 259, in _install
return self._build(tag)
File “/usr/lib/python3.6/site-packages/hassio/docker/addon.py”, line 274, in _build
image.tag(self.image, tag=‘latest’)
AttributeError: ‘tuple’ object has no attribute ‘tag’

Any idea how to get rid of this issue? I asked Dr. Google for hours now, but I don’t get any clue…

THANKS for your help!

Cheers,

Dave