Which operating system are you running on your computer?
Viewing post in Top Down Sprite Maker – Pixel Art Character Creator comments
Does it bring up the file dialog at all before it crashes?
If you are able to, please record your screen when you press (+) and the program crashes and send me the video to jordanbunkework@gmail.com.
Also, if you have a GitHub account, you can report a bug and we can move this conversation there. That will be the best place for anyone else who has this issue to find more information. If not, we can correspond here or via email.