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(intermittent) Error when attaching an article to a case

We are experiencing intermittent error when attaching a knowledge article to a case.


the error is:


Incorrect parameter type for operator '+'. Expected Number, Date, DateTime, received object
Error is in expression '{sectionIndex + 1}' in component <core.apexpages.components.cdk.ScopeSkipperComponent> in page null


the IE window/tab title (if it is relevant) is "Visualforce Error"


Do note that we don't have any Visualforce Page in our affected org, and we don't have that core.apexpages.components.cdk.ScopeSkipperComponent either.


What is this?


Thank you very much!