Get any project.
Configure VSS version control. In Settings / Version control provide all necessary settings with one condition: in "Edit VSS directory mapping" dialog the Directory value should end with slash: "C:\superPath\projectDir\".
Ok all. Do Refresh in Changes view. Result: Changes view is empty, and the exception is thrown.
If the value does not end with slash: "C:\superPath\projectDir" then all is Ok.
I see similar trace in IDEADEV-22729, IDEADEV-22385, but I suspect this can be different case.