Bevel edges of a box without cuts on corners

I'm trying to bevel the edges of a box, folded based on a die cut. (It is not a normal cube!) Any ideas how to get rid of these little spiky cuts at the corner? Is there a better solution for this problem? Thanks a lot guys, I'm a bloody beginner.

// Edit:

Ist comes from a folded die cut (plane with solidify mod.) with this shape:

It looks like this before bevel:

• You need to give us some more information, preferably what's the geometry before the bevel is applied, you probably have some topological errors that cause issues there… Here's how a bevel works on the default cube: i.imgur.com/IwIQNle.png and icosphere: i.imgur.com/zmfvyE1.png Even on some random geometry, while it looks bad, it doesn't have as big discontinuities as in yours: i.imgur.com/sdInxWm.png Try in Edit mode: A, M, B keys to remove doubles, shift+N to recalculate normals. Commented May 28, 2023 at 19:49
• I added an image of the die cut, wich is folded together in the first image. The geometry should be quit simple. Commented May 28, 2023 at 20:01
• I think a more reasonable approach is to make the beveled figure first, then unfold it. Then you can unwrap using e.g. Paper Model addon: youtube.com/watch?v=jqDGwpNEmy8 or Commented May 28, 2023 at 20:20
• This is a real die cut for a real product. In the end it has to look exactly like the box looks in the real world. I'm not free to make something up by my own, unfortunately. Commented May 29, 2023 at 2:55