Can't find reason for error log

@Pirol_62 wrote:

Hi,

I got the following error:

Sun Feb 23 2020 18:43:21 GMT+0100 (Mitteleuropäische Normalzeit)
Error during template condition: UndefinedError: 'None' has no attribute 'state'
Erfolgreich gespeichert

This error appears every 2.5 Minutes.
I checked every template in automation, sensors, binary sensors and switches.
All templates are working.
Where could that come from.
I’m on a fresh installed 105.3 and rasp 3+

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