How to find position of null in rule?

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maybe we can combine it with this topic:

How to catch rule exception

I had a rule which crashed because of an not existing command to an item. This exception causes the rule to not run to the end. Is there a way to prevent this, so that the rules runs to the end Example: rule "PresistenceWiederherstellen" when Item SW_PresistenceWiederherstellen changed to ON then gRestoreState.members.forEach[item | item.sendCommand(item.previousState(false,“mapdb”).state.toString) ] SW_PresistenceWiederherstellen.postUpdate(OFF) end This rule crashed on contacts, b…

Not really the same but goes in the same direction.

How to debug rules?
How to identify exceptions?

I’m interesting is this too.