Pushing to GitHub repository from my iceberg repository is hung (beachball). How do I interrupt the process?

I had been following the Developing a simple counter chapter. All was well. I created an iceberg repository and added my Project to it. I committed the sources to git. Still working OK. Then I did a push of all that to my GitHub/MichaelKentBurns/MyCounter repository. I got a progress bar for the push which never made any progress. Instead I got the beachball spinner. After quite some time I wanted to interrupt it to see if I could recover, but I could find a way. Eventually I had to force-quit. When I restarted my Pharo image, all of that work was lost because I had not done a save. My Question: Is there some way to interrupt such a process? Screen capture attached.