How to add error variable, if an error occurs do action A if no errors occur do action B

Friends, I’m trying to merge several different databases of different files into one, and I was successful with this flow. But a problem arose, in some files the desired tab appears and in others it doesn’t, so the flow stopped working. Basically, if in one of the files being consolidated there is no tab “X”, do nothing and move on to the next path. Can you help me?