niklasvh/html2canvas — pull request #341 by remdex (2014-02-15 22:32:38+00:00)
Title: Could not render because of incorrect argument for querySelectorAll

This happened on my site, then class selector contained generated classes like
"*, "
"breadcrumb >"
This replaces ", " to > "" and
last " > " to ""
This fixed the problem.