Fix broken script

I have a .html file which makes multiple calls to an API and caches the response.

Once all calls are done, a "download data" button appears and this puts the data into an excel spreadsheet.

Recently the download button has stopped working all of the time, I believe it to be that certain data returned from the API isn't in the correct format.

Looking for someone to fix it - to my untrained eye, the function you'll be fixing is in Javascript