Issue Summary

I imported a new Movie Video and deleted its layer after that, and when I tried to UNDO it to have the layer back pencil2D closed without warning

Steps to reproduce

Remember not to click any where besides the steps mentioned here, otherwise the issue will not show
File > Import > Movie Video > (I selected a 850kb MP4 movie video with sound). After imported successfully, go to Layers and delete the bitmap layer (which contains the movie video), and then click UNDO

One Note:
When importing a Movie Video, it will not import its audio. Is this intentional?

System Information

• Pencil2D Version:
  Last stable version v.0.6.5

• Operating System:
  Windows 10

• RAM Size:
  32GB

• Graphics Tablet:
  HUION HD 185