Input_boolean turn_off service server error

I’m encountering a server error while send Web Request from IFTTT to turn off an input_boolean.

It works fine with same item with turn_on service so I’m pretty sure my configuration is correct. Here is the error message log, and I would like see if anybody has idea or similar experience on what’s going wrong! Thanks

INFO:homeassistant.components.http:Serving /api/services/input_boolean/turn_off to 54.242.76.207 (auth: True)
ERROR:aiohttp.server:Error handling request
Traceback (most recent call last):
File “/home/homeassistant/.homeassistant/deps/aiohttp/web_protocol.py”, line 422, in start
resp = yield from self._request_handler(request)
File “/home/homeassistant/.homeassistant/deps/aiohttp/web.py”, line 306, in _handle
resp = yield from handler(request)
File “/usr/lib/python3.4/asyncio/coroutines.py”, line 143, in coro
res = yield from res
File “/usr/lib/python3.4/asyncio/coroutines.py”, line 143, in coro
res = yield from res
File “/srv/homeassistant/lib/python3.4/site-packages/homeassistant/components/http/ban.py”, line 58, in ban_middleware_handler
return (yield from handler(request))
File “/srv/homeassistant/lib/python3.4/site-packages/homeassistant/components/http/init.py”, line 424, in handle
result = yield from result
File “/srv/homeassistant/lib/python3.4/site-packages/homeassistant/components/api.py”, line 313, in post
data = json.loads(body) if body else None
File “/usr/lib/python3.4/json/init.py”, line 318, in loads
return _default_decoder.decode(s)
File “/usr/lib/python3.4/json/decoder.py”, line 343, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File “/usr/lib/python3.4/json/decoder.py”, line 359, in raw_decode
obj, end = self.scan_once(s, idx)