Scapple quit unexpectedly - kind of bug

Scapple quits unexpectedly when I try to drag and drop a corrupt (damaged) pdf file. The standard OSX window appears asking for ignoring/reporting the error or reopening the application.

I would say that is expected, if the PDF is damaged. It will crash OS X’s PDF viewer, which in turn will forcibly shut down the host application, Scapple in this case, to avoid damaging system stability.