These cubes toss out a lot of NULL triggers, so if the trigger action doesn’t filter them out you will get a lot of junk in the logs like that.
I don’t have ZHA, but the blueprint I wrote for Z2M takes that into account and only allows triggers into the automation that are valid. This Blueprint may have to be modified if you want to get rid of that.
A variation on the template trigger that you see in mine should solve that. If a trigger doesn’t have a valid keyword, it is not used and it does not throw an error.
(Note, I am assuming that this might help, I only looked at this blueprint for a moment but that’s the errors that would be with null triggers.)