Form's Select Causes 400 Error - is Not Submitting With the Form

Hi there!
I’ve got a form that seems to be working perfectly fine, except for one thing.

The select field on the form won’t submit anything!
The select field is “id_select_Budget_Cat_for_Request”.

Everything else submits correctly.

The weirdest part is that Wappler itself sees it fine - can even import it on the server action.

image720×570 26.2 KB

If I change my MySQL database so that id_select_Budget_Cat_for_Request can be NULL, then it submits fine. It’s just not including the select when it submits for some reason.

image814×688 51.6 KB

I feel like I must be missing something simple.

Here’s the select from the form itself.
Ignore the fact that I have the BudgCat_ID as the “Text Field” - it worked fine with the name, I just changed it to the number for testing purposes.

image454×586 13.6 KB