Table add-on event handler loading infinitely

[Sasha_Korovkina]

1. My goal: my goal is to make edits to rows within my table and save them, through a table add-on with an event handler.
2. Issue:
   I have the following table add on:

And the following event handler associated with it:

This triggers a query, which runs successfully, but my add-on stays in the loading state permanently, like so: