J3.7.1:Non SEF Urls Broken
From Joomla! Documentation
Errors reported
Non SEF URLs have broken links, menu items cause issues
Versions affected
General Information
This pertains only to Joomla! version(s): 3.7.1
What is the cause
A bug in Joomla! 3.7.1 was highlighted by a change in an upstream library
How to fix
Apply this patch, or wait for Joomla! 3.7.2