I pulled it out of the dishwasher, still hot. Did not think but went ahead and poured in a little coffee cream, cold from the fridge. I heard that little ping and, sure enough, my glass mug had a huge crack, splitting the bottom and up each side. I am annoyed with myself. I should have had my brain on but I was working on autopilot.
I found more of them. But, they are not available for online shopping. I did find some on eBay, but the shipping is expensive, beyond considering. So, I will just wait until I am somewhere there is an Ikea store. Funny, Ikea is so popular but this will be the first time I have ever had a plan to shop there. But, the mugs (called beer tankards) are in stock.