Steps to reproduce the issue
Click on the "related Items" Menu item in the All-Modules menu on the frontend
Expected result
Display content
Actual result
Displays content with error message (see image)
System information (as much as possible)
PHP Built On | Windows NT DJ-DESKTOP 10.0 build 15063 (Windows 10) i586
Database Version | 5.5.5-10.1.9-MariaDB
Database Collation | utf8_general_ci
Database Connection Collation | utf8_general_ci
PHP Version | 7.0.4
Web Server | Apache/2.4.18 (Win32) OpenSSL/1.0.2e PHP/7.0.4
WebServer to PHP Interface | apache2handler
Joomla! Version | Joomla! 4.0.0-dev Development [ Amani ] 31-March-2017 23:59 GMT
User Agent | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36

Additional comments
Can't confirm.Issue confirmed (Firefox didn't show Message but block empty Space)
System information
4.0.0-dev
macOS Sierra, 10.12.6
Firefox 57 (64-bit)
MAMP 4.1.1
This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/18653.