DOMDocument::loadXML(): Empty string supplied as input FeedsXPathParserXML.inc:29

Problem/Motivation

Using the latest dev I receive the following error on cron:

DOMDocument::loadXML(): Empty string supplied as input FeedsXPathParserXML.inc:29

If I revert back to this point (the minimum version that I need):
https://github.com/drupalprojects/feeds/commit/f6aa61db2099d38d7bec96231...
the error does not occur.