Every time, you try to display a webpage with PHP error (500 for example) and error report is defined as none, you get a blank webpage without content.
In order to report the issue, apply the next steps to get the error message:
Go to the system configuration of Joomla in the backend and define "Development" in "Error reporting"
Afterwards, you should get an understandable error message.
You can alaso check the php error logs if logging is activated.