Vendor JS Error on iOS (ionic v3)

I am currently working on an application that is already in production. Up until this moment, I have been able to build for both Android and iOS and push to their respective stores with no issues.

I recently started getting an issue with vendor.js. The error reads:


This error is stopping me for making an API call. The functionality is working on Android, but not iOS. I am not sure if the error is caused by the iOS platform itself or if there’s something I need to do. The error is not very descriptive so I don’t really know what to do.