Problem with Strings to Document 5.4.2

Hi everyone, I'm having a small problem. When I try to use the Strings to Document node in KNIME version 5.4.2, I get this error:
"Could not store document in cell: PAGOBANCOMAT MAESTRO CA230
ERROR
Strings to Document 9:2495 Execute failed: Cell at index 0 is null!"
The node with the same configuration in version 4.6 (I know it's a bit dated) works correctly. I've attached a screenshot of the two configurations.
4.6

5.4.2

Thank you so much for your help