Runnable sample code (assuming that file '~some_existing_file_path' exists):

The intention here is to take use a file description as a storage area for a single row of data. As-is, the code works.

To show the error, swap the comments around on the last two lines, so that Get_Bad() is called. The result is a segfault:

The primary workaround seemed to be the creation of the Convert(STRING j) attribute within Get_Good().