Empty line inserted in database

I have a sales form, and a sales_lines form.

When I enter the details of a sale I can click on the "Add sales lines" button which opens the sales_lines form (the sale_ID is passed on to the sales_line form). In sales_lines form I can edit all the line items for that sale and then I perform a pretty straight forward insert SQL.

This is the only place where I have an Insert sql line (not very far in development.). I did not remove the alert for sql commands on my table so I get the popup saying "We will now append 1 row into sales_lines table". However after I create a sale with for example 3 sales_lines, and I get 3 popups each saying "we will append 1 row" I always end up with 4 lines in my sales_lines table. The first one is empty and then the 3 others are the ones I entered.

Does anybody know where that might come from?

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