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Hi Jacsdad,
We're still working on this issue and we have did some editing to the sample workbook you provided. We used Text to Columns to convert the data in the problematic column and see that the error disappears.
The ZIP codes you entered in the column may have came from different sources and not typed by hand, so the data type might not have been stored as a Number.
We have tried to clean your workbook and we have not seen the error pop up again. We will provide it via private message, please use it for a few days and let us know if the error shows up again.
For your reference:
Convert numbers stored as text to numbers
Top ten ways to clean your data
Regards,
Sheen