Error while processing template - jinja2.exceptions.UndefinedError: 'None' has no attribute 'state'

[adamf83]

The problem

On my dashboard, I have a Mushroom Chip that within it's content has a template to work out how many lights are switched on at any given time and display the number.

{% set entities = [states['light.bathroom_light'],states['light.hall_light'],states['light.kitchen_lights'],states['light.living_room_lights'],states['light.bedroom_light'],states['light.adams_bedroom_lamp_light'],states['light.bedroom_lamps'],states['light.ikea_of_sweden_tradfribulbe14wscandleopal470lm_light'], states['light.essentials_a19_a60']] %} {{ entities | selectattr('state','eq','on') | list | count }} lights on

Since upgrading to 2024.4.0 (and trying 2024.4.1 to see if it was fixed) this seems to have stopped working, producing the following error:

Error while processing template: Template<template=({% set entities = [states['light.bathroom_light'],states['light.hall_light'],states['light.kitchen_lights'],states['light.living_room_lights'],states['light.bedroom_light'],states['light.adams_bedroom_lamp_light'],states['light.bedroom_lamps'],states['light.ikea_of_sweden_tradfribulbe14wscandleopal470lm_light'], states['light.essentials_a19_a60']] %} {{ entities | selectattr('state','eq','on') | list | count }} lights on) renders=42>

However, under Developer Tools -> Template when I paste the template into the editor, it is working correctly and displaying the number of lights that are on.

What version of Home Assistant Core has the issue?

core-2024.4.1

What was the last working version of Home Assistant Core?

core-2024.3.3

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Template

Link to integration documentation on our website

https://www.home-assistant.io/integrations/template/

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

Traceback (most recent call last):
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 586, in async_render
    render_result = _render_with_context(self.template, compiled, **kwargs)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 2545, in _render_with_context
    return template.render(**kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/environment.py", line 1301, in render
    self.environment.handle_exception()
  File "/usr/local/lib/python3.12/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/python3.12/site-packages/jinja2/async_utils.py", line 45, in wrapper
    return normal_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/filters.py", line 1338, in sync_do_list
    return list(value)
           ^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/filters.py", line 1779, in select_or_reject
    if func(item):
       ^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/filters.py", line 1764, in <lambda>
    return lambda item: modfunc(func(transfunc(item)))
                                ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/filters.py", line 1759, in func
    return context.environment.call_test(name, item, args, kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/environment.py", line 589, in call_test
    return self._filter_test_common(
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/jinja2/environment.py", line 545, in _filter_test_common
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
jinja2.exceptions.UndefinedError: 'None' has no attribute 'state'

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 712, in async_render_to_info
    render_info._result = self.async_render(
                          ^^^^^^^^^^^^^^^^^^
  File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 588, in async_render
    raise TemplateError(err) from err
homeassistant.exceptions.TemplateError: UndefinedError: 'None' has no attribute 'state'

Additional information

No response

[home-assistant]

Hey there @PhracturedBlue, @tetienne, @home-assistant/core, mind taking a look at this issue as it has been labeled with an integration (template) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of template can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Renames the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign template Removes the current integration label and assignees on the issue, add the integration domain after the command.
• @home-assistant add-label needs-more-information Add a label (needs-more-information, problem in dependency, problem in custom component) to the issue.
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