totalCount error, number of items: 0 vs 1


I´ve an error that I cannt resolve:

For this case, I load a grid with the data from my database. Then, I create a filter, and the error occurs when selecting a value that does not exist in the database for a column.

The query to the database returns 0 element and an empty list. But it seems that a record is loaded at null.

The code is:

And the ER answer:

Any idea where I could look?
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