Reddit phone app closes when I try to access a group chat

Whenever I touch the r/tightywhities group chat icon the Reddit app on my iPhone 12 closes (quits). I was an invited member of this group and had accessed it many times before. This morning, while half awake, I may have selected Block in the pull-aside menu. Ever since then I can see this chat group on my PC browser but can't get to it on the iPhone app. Did I really block it on in the iOS App? What to do?