Stock just shows as a number

When I list all my stocks there is now one at the top of the list that is just an 8 digit number. It shows 1 stock with a zero value. When I click on it to get the "quote details" it just gives me an error.

I don't recall ever buying 1 share of a stock, but it's possible.

Is this just someone that went out under? Is there a way to find out what company it was?