Hello there,

The issues I addressed is in this line: https://github.com/flutter/flutter/blob/master/packages/flutter/lib/src/material/dialog.dart#L705

When the showDialog pageBuilder is trying to get the theme it is using the context from showDialog and not the context from the pageBuilder. The issue is that the context from showDialog can be invalid ex. when the application waked from a suspended state.

My suggestion to fix it, is to change:

final ThemeData theme = Theme.of(context, shadowThemeOnly: true);

to

final ThemeData theme = Theme.of(buildContext, shadowThemeOnly: true);

Steps to Reproduce

1. Call Show dialog, with a textfield as child
2. Suspend the entire application
3. Wake up the application
4. Go to landscape mode and see the application will crash

Logs