TMSFNCPageControl issue

Deleting a TMSFNCPageControl from a form crashed Lazarus 1.6.4 (Win10). 

Was unable to reopen the Project. 

Opened the form in question and the 'objects' for the page were still in the form code.

Removed code manually, and was then able to reopen form and project. 

I have retested this here but I could not reproduce such issue. 

Is this with the latest version of the TMS FNC UI Pack?
If so, do you have more  details about this?