Project fails to publish, Error: Cannot read property '_id' of undefined"

Hi,

i have a project where i somehow stopped being able to publish the project.
I get the following error: “Error: Cannot read property ‘_id’ of undefined”

Now i use custom code, however, if i duplicate the project, remove all custom code the problem still exists. The console throws some ajax errors at me:

Anybody had the same problem before?

Problem was solved through webflow support.
There was an element inside of a symbol that i had to delete, it was basically a language select overlay with a secondary navigation.
Can’t really tell what specifically caused the bug, but it’s solved from deleting the language overlay.

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