UV-size should not be 0

[clear sorrel]

I have 2d textures in my model (see image) and since I can only add cubes as shapes I guess it wants there to be sides to it? The sides are in the texture right now just with 0 size? How can I fix this or can I ignore it?

[barren pecan]

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[brave vine]

You can ignore it, but the cleaner way would be to completely remove the 0 wide faces (with the X symbol below the UV screen).
While you won't ever see those faces the game still has to iterate over them every render tick, so it's better for performance to remove them.
Iirc the Optimize tool from the "Optimize" plugin removes 0 wide faces like that if you don't wanna do it manually.