I've got an application in my Updates list which I never installed. It doesn't appear under Purchases nor Hidden Purchases. I can't hide it by right-clicking on it. When I click "Update" it asks me for some different Apple ID I've never heard of.

How can I get rid of the update showing up?

![enter image description here][1]


  [1]: https://i.sstatic.net/9kfvK.png