Fatal error when using Views to Display "As Bar" and Show Next Link/ (workaround possible)

I was attempting to create a view in which only the Content: Completeness field is shown (to use in Panels).

I created a view in which the only field I displayed is "Content: Completeness" for a node with Content Complete enabled. I set "Display As" to "Bar" and enabled "Show next link."

This resulted in the following error:

Fatal error: Unsupported operand types in /srv/bindings/3bacc2f8aa6a48ad8062bb6648035677/code/sites/all/modules/content_complete/content_complete.module on line 516

-> If I uncheck "Show next link," the error disappears, so it may be a problem with "Show next link."

Workaround->
Add the Content: Title field to the fields for display under views. The Content: Title field can be hidden via "exclude from display," giving the same effect as displaying only the Content: Completeness field.

Adding a field other than Content: Title does not appear to resolve the error (I tried Content: Comment Status and Content: Type, but the error remained.)