Timer rule not working right in oh3

Recognisably, one of your Items has a state NULL and whatever you are trying to do with it, can’t be done.

Likely culprit -

thank you very much, thats it, only one question, this is a string item and sitemap:

Setpoint item=ArbeitszimmerLichtDauer label="Arbeitszimmer" step=1 minValue=1 maxValue=30 icon="time"

why is the rrdj4 not saving these value and restoring at reboot?

rrd4j doesn’t store strings.

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the rules working again thx, can i easy change the string item to an number item?