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Changing a MasterDetail Pages title after the app resumes will cause an exception.
**Steps to Reproduce:**
1. Start the app
2. Open the Menu (click on the back-arrow)
3. Click on "Goto subpage"
4. Click on "Change language to XY"
5. Navigate back through the navigation stack until the app is minimized
6. Reopen the app
7. Open the Menu (click on the back-arrow)
8. Click on "Goto subpage"
9. Click on "Change language to XY"
System.NullReferenceExceptionObject reference not set to an instance of an object
See attached stacktrace.txt
**Build Date & Platform:**
Created attachment 15058 [details]
Use this sample for reproducing the issue.
I tried to reproduce this on AppCompat, but I could not. Looks like this might be an issue with FormsApplicationActivity.