404 causing error with lightbox code

Hello, I am not sure of why this 404 url is being called, but for some reason when a 404 page is generated with Timber at a specific url, the $_GET[‘page’] variable is populated with an array (?), and since your plugin code is running strrpos() on any value besides null, this error is being thrown: see attached

I wonder if I could respectfully request that you please type check that value in your code, to ensure it is indeed a string, prior to strrpos() being called?

That would sure help us a lot, while we try to also resolve the reason why that variable is populated in this case.