Program shuts down after giving error message

I meant to go and check something in a Groupshare project that I had checked in and which is no longer available on the server. I am of course denied access to it, but worse than that, once I click OK to remove the popup error message "Project with ID xxxxx doesn't exist', the Studio 2017 program shuts down. There is seemingly no way I can use the program and move onto another project. What can I do to remedy this?