I saw a tag with no name when I loaded your model (without fix). Changed it to “blank” and so far the model hasn’t crashed SketchUp on my Mac. Model Info ->statistics->fix problems found a few more things to repair (unrelated to tags), and it still isn’t crashing. I can see why a blank tag name would be unacceptable, but it should have been trapped not cause a crash!
Are you getting a BugSplat when it crashes? If so, are you sending the reports in? It would help customer support if you cite this topic in the crash report and the copy the crash number here.
If you aren’t getting a BugSplat, that usually means that SketchUp aborted due to an unrecoverable error that doesn’t fit any of the standard crash reasons (signals, in macOS). This kind of suicide can’t be trapped by BugSplat, but does leave a crash report in
~/Library/Application Support/Logs/Diagnostic Reports
Edit: getting blank or one-character tag names is a long-known issue with the SketchUp GUI on Mac: unless you click outside the name field, the next thing you type overwrites the name you entered. Typically it’s a shortcut for a tool, and space (for select) is very common.
Edit 2: It appears that this cut through the wall was the only thing using that unnamed tag