Crashing on Export

[Tofudono]

Hello!
I have just started using Krita to animate and installed this plugin to make spritesheets.

It's creating the spritesheet perfectly. Though it seems to crash Krita every time I attempt to overwrite a sprite sheet that I've already created in the one particular session. Repro steps:

1. Open file
2. Select "Export to Spritesheet"
3. Select "OK"
4. Export to Spritesheet and make sure its outputting to the same file
5. Observe crash