I was preparing a title and I had decided to go with Oh, no! Stumbled upon the void?
since its a title for the web that I decided to go without the "Did you stumble" part.
But when I looked up in the dictionary I understood that stumble upon doesn't convey the meaning.
Definition of stumble across/on/onto/upon : to find or learn about (something) unexpectedly I stumbled across/on/upon this book by chance. We stumbled onto/across the ruins of an old fort. They stumbled on/upon a bizarre plot. He stumbled onto the truth.
So is there a better way than to say Oh, no! Stumbled upon the void?