It may be crashing due to the datasource you're connecting to. Before looking into that though, if you need to stay on 2018.1, you should at least update to the latest version, which is 2018.1.6. Otherwise I'd recommend updating to 2018.3. You can find links to all Tableau versions here:
That may fix the issue for you. If not, look into whether you can extract any datasource, and if so, it may be that one datasource giving you issues (there may be a timeout rule in place, or something like that).