It is hard to know what exactly is the issue from report like this. He might be missing some dependencies, his AV might trigger a false positive for Electrum, his RAM could be faulty, etc. I'd rather ignore it until more info shows up.
It's working fine to me without any issue in windows 7 32bit currently tested is the portable one.
The issue above it was the same as my problem with 4.0.2 everytime you close the Electrum it crash but it's working fine you just need to force close them and reopen the Electrum.
But this 4.0.4 solve my crash issue.
He might be using Ubuntu 18.04 which I heard super buggy. So there might be issue from the OS that cause wallet crash everytime he close the Electrum.