#4 PNG conversion no longer works with pdflatex

[Marko Pinteric]

Since MikTeX update, I have a problem that I described here

https://tex.stackexchange.com/questions/579106/making-png-files-with-standalone-no-longer-works

I suspect there could be some bug with standalone, since there is a spurious message

(\end occurred when \ifx on line 3 was incomplete)

Could you please check?