That’s the way it looked before the update

and this ist after

LOGs:
Logger: homeassistant.helpers.template_entity
Source: helpers/template_entity.py:364
First occurred: 21:03:41 (1 occurrences)
Last logged: 21:03:41
TemplateError('ValueError: Template error: float got invalid input 'unknown' when rendering template '{{ (states('sensor.aktueller_uberschuss') | float) - (states('sensor.aktueller_bezug') | float) | round(0) }}' but no default was specified') while processing template 'Template("{{ (states('sensor.aktueller_uberschuss') | float) - (states('sensor.aktueller_bezug') | float) | round(0) }}")' for attribute '_attr_native_value' in entity 'sensor.template_ueberschuss_bezug'
Logger: homeassistant.helpers.event
Source: helpers/template.py:459
First occurred: 21:03:41 (1 occurrences)
Last logged: 21:03:41
Error while processing template: Template("{{ (states('sensor.aktueller_uberschuss') | float) - (states('sensor.aktueller_bezug') | float) | round(0) }}")
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 1745, in forgiving_float_filter
return float(value)
ValueError: could not convert string to float: 'unknown'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 457, in async_render
render_result = _render_with_context(self.template, compiled, **kwargs)
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 1984, in _render_with_context
return template.render(**kwargs)
File "/usr/local/lib/python3.10/site-packages/jinja2/environment.py", line 1301, in render
self.environment.handle_exception()
File "/usr/local/lib/python3.10/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/src/homeassistant/homeassistant/helpers/template.py", line 1748, in forgiving_float_filter
raise_no_default("float", value)
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 1446, in raise_no_default
raise ValueError(
ValueError: Template error: float got invalid input 'unknown' when rendering template '{{ (states('sensor.aktueller_uberschuss') | float) - (states('sensor.aktueller_bezug') | float) | round(0) }}' but no default was specified
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 575, in async_render_to_info
render_info._result = self.async_render(variables, strict=strict, **kwargs)
File "/usr/src/homeassistant/homeassistant/helpers/template.py", line 459, in async_render
raise TemplateError(err) from err
homeassistant.exceptions.TemplateError: ValueError: Template error: float got invalid input 'unknown' when rendering template '{{ (states('sensor.aktueller_uberschuss') | float) - (states('sensor.aktueller_bezug') | float) | round(0) }}' but no default was specified