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Hi @CU31120352-0

The error is saying: Your Update item action is calling length() on something that came back null.

length() only works with a string or an array, so if the value is null the run fails (this happens a lot with optional fields like comments, responses, attachments, etc.).

Fix:

Go into the Update item action and find the expression that looks like:
length(<something>)or length(<something>) > 0 (or something similar)
Then make it null-safe by wrapping the value with coalesce() (treat null as empty):

If <something> is text
length(coalesce(<something>, ''))
If <something> is an array (e.g., attachments/value)
length(coalesce(<something>, createArray()))

Let me know if it worked if not, please add a screenshot of your Update item action in edit mode.