0.25.2 Won't start when I insert a MQTT sensor

Configuration
1

I have MQTT working with one GPIO output on a Nodemcu and can turn the output on an off. I have a second unit with a temperature sensor on the MQTT topic /ESP02/Dallas/Temperature. When I add the following to the configuration file, HA won’t start and no log file is created making debugging somewhat dificult.

sensor:
  platform: mqtt
  state_topic: "/ESP02/Dallas/Temperature"
  name: "ESP02 Temp"
  qos: 0
  unit_of_measurement: "°C"
  value_template: '{{ value.x }}'

Removing that text and rebooting allows HA to start. Any clues?

2

Without logs or a complete file it’s pretty hard to try to help.
I suggest you post a sanitized verision of your config to hastebin.

3

Yep, no logs available and using sudo journalctl -f -u home-assistant@pi produces no output either. Basic config file here http://pastebin.com/WXNBfpKT

4

Moved to this thread MQTT Sensor kills HASS