Are you seeing a crash in Details Customization?

Question

We got a crash when, in the UE4 Editor, we delete an audio actor containing a UAkSurfaceReflectorSetComponent, then undo.

The reason is that FAkSurfaceReflectorSetDetailsCustomization was keeping a raw pointer to IDetailLayoutBuilder.  That needs to be a TWeakPtr with appropriate validity checks at each usage.  We found the same problem in FAkLateReverbComponentDetailsCustomization and FAkRoomComponentDetailsCustomization.

The fix is to change each class's MyDetailLayout member variable to:
 

TWeakPtr<IDetailLayoutBuilder> MyDetailLayout;

 

Then override this additional function from the baseclass:

 

virtual void CustomizeDetails( const TSharedPtr<IDetailLayoutBuilder>& DetailBuilder ) override;

 

Use that function to initialize your weak pointer from the shared pointer, then call the other CustomizeDetails with the raw pointer from there.

Hope this helps!