Facebook-sdk-for-unity: (iOS)Updating from old sdk causes app crash on existing users.

[GarlicDipping]

Checklist

• [x] I've updated to the latest released version of the SDK
• [x] I've searched for existing GitHub issues
• [x] I've looked for existing answers on Stack Overflow, the Facebook Developer Community Forum and the Facebook Developers Group
• [x] I've read the Code of Conduct
• [x] This issue is not security related and can safely be disclosed publicly on GitHub

Environment

Describe your dev environment here, giving as many details as possible. If you have them, make sure to include:

• Unity Editor Version: 2017.4.37f1
• Unity SDK Version: 7.19.1
• Installation Platform & Verison: [iOS] version 13.3.1

Steps to Reproduce

Updating from old FB Unity SDK(7.13.0) to recent(7.19.1) causes crash on existing users, who already logged-in and cached their accesstoken.

[MagicMiikka]

For us it crashes to following:

We updated from 7.18.1 to 7.19.1
Unity 2018.4.18f1

FBUnityUtility.mm line 211
+[FBUnityUtility getUserDataFromAccessToken:]

[iquintero]

This is now fixed in v7.19.2 :)