Rule Error why?

[job (Joachim Boeddeker)]

No, but this error is quite some time around.

[SOLVED] Error: Rule '<rulename>': null

I receive a strange error from time to time i am struggling to find a reason within my rule. I have three groups for a bunch of thermostats. gActTemp contains all current temperature readings, gSetTemp contains all target temperatures and a group of unbound Numbers contains the diff (gDiffTemp). The rule triggers on a update of gActTemp, finds the last changed temperature, chooses the corresponding target & diff items and calculates the difference between current and target temperature again. …

I already tried to log everything, this error stays.

The triggeringItem/Member of did not help either, this error stays, not all the time but every once in a while.

Thanks for the for-loop, i did not know that this was existing. I also have a variable/lambda problem.