title: How to fix crash when modifying Core Data with a new version of an app in iOS
body: <p>I am struggling with an issue related to Core Data.</p>
  
  <p>In my app, I use Core Data for storing and retrieving the values. In my latest version, I added some attributes to entities from the old version. I updated the app from the App Store, and when I click on the page where we need to display the contents from Core Data, it is crashing.</p>
  
  <p>If the old version of the app is removed and the new one is downloaded, then it doesn't crash.</p>
  
  <p>My requirement is any alternative there is to fix without having to remove the old version of the app (merging the old version with the new version).</p>
  
  <p>Any suggestions on how to fix this issue?</p>
  
  <p>Thanks in advance.</p>