Crash when compiling Camera Component BP with PostProcessSettings visible

When compiling a blueprint derived from a Camera Component with PostProcessSettings showing in the details panel the Editor crashes. This does not occur in 4.17.2 (3658906) so in addition to a crash it is also a regression.

1. Create new blueprint derived from CameraComponent and open it
2. Make sure Class Defaults is selected and type in PostProcessSettings in the Details pane
3. Compile

Results: Editor crashes
Expected: BP compiles successfully

Crash when compiling custom CameraComponent BP