A white screen or error 500 indicates a script error, or a server issue such as low memory. Error messages are usually suppressed so you get a white screen instead of something useful.
To see what the issue is, you can either:
1. Look through your server error logs. The location of these vary from host to host, but if you can find them, look for a ‘fatal error’
2. Enable WP_DEBUG https://codex.www.ads-software.com/WP_DEBUG
WP_DEBUG will make the white screen turn into a useful error message which should tell you where the problem is coming from.
Thanks