How do i fix Template variable error: None has no element 0 when rendering

Configuration
1

the logger says

Logger: homeassistant.helpers.template
Source: helpers/template.py:684
First occurred: 11:45:00 AM (8 occurrences)
Last logged: 11:45:00 AM

Template variable error: None has no element 0 when rendering '{{ state_attr('weather.peterborough_forecast', 'forecast')[0].templow }}'
Template variable error: None has no element 0 when rendering '{{ state_attr('weather.peterborough_forecast', 'forecast')[0].temperature }}'
Template variable error: None has no element 0 when rendering '{{ state_attr('weather.peterborough_forecast', 'forecast')[0].precipitation_probability }}'
Template variable error: None has no element 0 when rendering '{% if state_attr("weather.peterborough_forecast","forecast")[0].condition =='clear-night' %} 3 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='cloudy' %} 5 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='fog' %} 16 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='hail' %} 6 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning' %} 13 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning-rainy' %} 17 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='partlycloudy' %} 8 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='pouring' %} 18 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='rainy' %} 9 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy' %} 11 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy-rainy' %} 7 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy' %} 14 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy-variant' %} 14 {% else %} 12 {% endif %}'

how do i fix it?

and the other logger error is

Logger: homeassistant.helpers.event
Source: helpers/template.py:565
First occurred: 11:45:00 AM (4 occurrences)
Last logged: 11:45:00 AM

Error while processing template: Template<template=({{ state_attr('weather.peterborough_forecast', 'forecast')[0].templow }}) renders=2>
Error while processing template: Template<template=({{ state_attr('weather.peterborough_forecast', 'forecast')[0].temperature }}) renders=2>
Error while processing template: Template<template=({{ state_attr('weather.peterborough_forecast', 'forecast')[0].precipitation_probability }}) renders=2>
Error while processing template: Template<template=({% if state_attr("weather.peterborough_forecast","forecast")[0].condition =='clear-night' %} 3 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='cloudy' %} 5 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='fog' %} 16 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='hail' %} 6 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning' %} 13 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning-rainy' %} 17 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='partlycloudy' %} 8 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='pouring' %} 18 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='rainy' %} 9 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy' %} 11 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy-rainy' %} 7 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy' %} 14 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy-variant' %} 14 {% else %} 12 {% endif %}) renders=2>
Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 563, in async_render
    render_result = _render_with_context(self.template, compiled, **kwargs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 2179, in _render_with_context
    return template.render(**kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/jinja2/environment.py", line 1301, in render
    self.environment.handle_exception()
  File "/usr/local/lib/python3.11/site-packages/jinja2/environment.py", line 936, in handle_exception
    raise rewrite_traceback_stack(source=source)
  File "<template>", line 1, in top-level template code
  File "/usr/local/lib/python3.11/site-packages/jinja2/sandbox.py", line 326, in getattr
    value = getattr(obj, attribute)
            ^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 2205, in _fail_with_undefined_error
    raise ex
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 2196, in _fail_with_undefined_error
    return super()._fail_with_undefined_error(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
jinja2.exceptions.UndefinedError: None has no element 0

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 684, in async_render_to_info
    render_info._result = self.async_render(variables, strict=strict, **kwargs)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 565, in async_render
    raise TemplateError(err) from err
homeassistant.exceptions.TemplateError: UndefinedError: None has no element 0

Logger: homeassistant.helpers.template_entity
Source: helpers/template_entity.py:397
First occurred: 11:45:00 AM (4 occurrences)
Last logged: 11:45:00 AM

TemplateError('UndefinedError: None has no element 0') while processing template 'Template<template=({{ state_attr('weather.peterborough_forecast', 'forecast')[0].templow }}) renders=4>' for attribute '_attr_native_value' in entity 'sensor.today_min'
TemplateError('UndefinedError: None has no element 0') while processing template 'Template<template=({{ state_attr('weather.peterborough_forecast', 'forecast')[0].temperature }}) renders=4>' for attribute '_attr_native_value' in entity 'sensor.today_max'
TemplateError('UndefinedError: None has no element 0') while processing template 'Template<template=({{ state_attr('weather.peterborough_forecast', 'forecast')[0].precipitation_probability }}) renders=4>' for attribute '_attr_native_value' in entity 'sensor.today_rain'
TemplateError('UndefinedError: None has no element 0') while processing template 'Template<template=({% if state_attr("weather.peterborough_forecast","forecast")[0].condition =='clear-night' %} 3 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='cloudy' %} 5 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='fog' %} 16 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='hail' %} 6 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning' %} 13 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning-rainy' %} 17 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='partlycloudy' %} 8 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='pouring' %} 18 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='rainy' %} 9 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy' %} 11 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy-rainy' %} 7 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy' %} 14 {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy-variant' %} 14 {% else %} 12 {% endif %}) renders=4>' for attribute '_attr_native_value' in entity 'sensor.today_icon'
2

You either need to test for the existence of the forecast attributes or use an availability template. Show your full template sensor config for the four template sensors that use weather.peterborough_forecast.

3

here is the coding
it used to work long ago no errors then i had to add the [0] i found out as it was throwing and error… so this is the current setup… i trying to fix all the errors in my logs

sensor:
  - platform: template
    sensors:
      today_min:
        value_template: "{{ state_attr('weather.peterborough_forecast', 'forecast')[0].templow }}"
        friendly_name: Today's maximal temperature
      today_max:
        value_template: "{{ state_attr('weather.peterborough_forecast', 'forecast')[0].temperature }}"
        friendly_name: Today's minimal temperature
      today_rain:
        value_template: "{{ state_attr('weather.peterborough_forecast', 'forecast')[0].precipitation_probability }}"
        friendly_name: Today's rain forecast
      today_icon:
        value_template: >-
          {% if state_attr("weather.peterborough_forecast","forecast")[0].condition =='clear-night' %}
            3
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='cloudy' %}
            5
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='fog' %}
            16
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='hail' %}
            6
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning' %}
            13
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='lightning-rainy' %}
            17
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='partlycloudy' %}
            8
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='pouring' %}
            18
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='rainy' %}
            9
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy' %}
            11
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='snowy-rainy' %}
            7
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy' %}
            14
          {% elif state_attr("weather.peterborough_forecast","forecast")[0].condition =='windy-variant' %}
            14
          {% else %}
            12
          {% endif %}
        friendly_name: Today weather forecast
4

So the first thing to check is if weather.peterborough_forecast actually has a state and attributes. Look in Developer Tools → States.

If it does, what does this return in the Template Editor:

{{ state_attr('weather.peterborough_forecast', 'forecast') }}
5

it displayed this

[
  {
    "datetime": "2023-08-17T12:12:44.355735-04:00",
    "condition": "rainy",
    "precipitation_probability": 30,
    "temperature": 26,
    "templow": 15
  },
  {
    "datetime": "2023-08-18T12:12:44.355744-04:00",
    "condition": "rainy",
    "precipitation_probability": 60,
    "temperature": 21,
    "templow": 9
  },
  {
    "datetime": "2023-08-19T12:12:44.355751-04:00",
    "condition": "partlycloudy",
    "precipitation_probability": 0,
    "temperature": 23,
    "templow": 12
  },
  {
    "datetime": "2023-08-20T12:12:44.355758-04:00",
    "condition": "rainy",
    "precipitation_probability": 30,
    "temperature": 28,
    "templow": 13
  },
  {
    "datetime": "2023-08-21T12:12:44.355764-04:00",
    "condition": "rainy",
    "precipitation_probability": 30,
    "temperature": 26,
    "templow": 10
  },
  {
    "datetime": "2023-08-22T12:12:44.355770-04:00",
    "condition": "rainy",
    "precipitation_probability": 60,
    "temperature": 25,
    "templow": 15
  }
]
This template listens for the following state changed events:

Entity: weather.peterborough_forecast
6

It may display a value now but, according to the error message, it had no value at 11:45. It implies that occasionally it doesn’t get any data from your weather provider.

Do what tom_l suggested and add the availability_template option to your weather-based Template Sensors.

For example:

      today_min:
        value_template: "{{ state_attr('weather.peterborough_forecast', 'forecast')[0].templow }}"
        friendly_name: Today's maximal temperature
        availability_template: "{{ state_attr('weather.peterborough_forecast', 'forecast') is not none }}"
3 Likes
7

ok ill add that… ya glad you guys know what your doing… as i sure dont lol

is the avalabilty template amd the is not none to make it when like HA boots up it sets a value to each sensor so its not blank and throws an error for a NaN?