(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.