How to read level data correctly?

[art0007i]

I created a simple program which prints out the first 10 objects inside of a level chosen by the user. (repo link)

This seems to work for the most part, but on some levels I get the error The given key '0' was not present in the dictionary..

This seems to happen on certain copyable after copying them.
Here are a few levels I've tried and experienced this with

• Bloodbath copy (id 10978435)
• Object IDs (id 58079690)
• DeCode Layout (id 40032510)

I don't know if this is caused by me doing something wrong or the library struggles to load these levels for whatever reason, which is why I'm making this post.

[Rekkonnect]

With further inspection there appears to be a problem in GuidelineCollection.Add, which assumes that the color of the guideline is correct and can be mapped. Making this a bug report