Cannot use '=~' with operands of type null and regexp

Anyone get this error in a Decision Step?
I first check to see if it is defined, but don’t know how to check for null?

I usually do {{[“Action - 1”].[step]}}="" to check for null/empty values

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thanks, I added that to my logic, I’ll have to wait until the next time this triggers to know for sure

For anyone interested, this worked
{{[“Action - 1”].[step]}} != null
no quotes around the null