ERROR in RuleEngine - Rule XXX: null

[job (Joachim Boeddeker)]

I still have this error from time to time and according to my opinion, it has nothing to do with the rule code itself.

Even if you check everything with an if statement the error still occurs.

Sometimes (not reproduceable, it’s some kind of a race condition) openHAB is unable to run the rule.

[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. …