Invalid Form Control Error in Version 8

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I am working on updating one of my addons. It works perfectly fine in 5.7.x, but when I try to add the block to a page in 8.3.2, nothing happens. Pressing the "Save" button does nothing, and I get an error in the console:

An invalid form control with name='someRandomVariable' is not focusable.


EDIT: Nevermind, figured it out. I had a mismatching default value for one of the inputs.

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