Retrieve data from website in iOS -- Fix Bug! -- 3

BACKGROUND: I had someone on Freelancer write a simple app that retrieves data from a website. I've integrated this functionality into my app. I haven't updated the app in 2 years and now I'm fixing deprecated methods. ISSUE: There is one bug that I cannot figure out. I use ZBAR SDK to scan barcodes and it has worked up until the latest iOS release. Now, when the camera opens, the app crashes. So the barcode scanner is broken. I can spend $40USD on this. There is also an opportunity to make a little extra. I implemented interstitial ads but haven't figured out IAP's yet. If you can create an IAP to remove the ads, that would be another $20. Thanks