Apparently this application does not detect if the data to burn is larger than the space available on disk. The application shows an error (because there is not enough space on the disk), then I can insert the disk and see the files but Finder crashes if I click on one.

That is a serious flaw. If the developer is reading, what I really wish is that YuBurner asks me to "insert another blank disk" and so on until all the data is burnt to disk. It would be perfect for backups.