diff -ru texlive-20180414-source.orig/texk/dvisvgm/dvisvgm-src/libs/ff-woff/fontforge/tmpfile2.cpp texlive-20180414-source/texk/dvisvgm/dvisvgm-src/libs/ff-woff/fontforge/tmpfile2.cpp

--- texlive-20180414-source.orig/texk/dvisvgm/dvisvgm-src/libs/ff-woff/fontforge/tmpfile2.cpp	2018-01-18 00:50:15.000000000 +0200

+++ texlive-20180414-source/texk/dvisvgm/dvisvgm-src/libs/ff-woff/fontforge/tmpfile2.cpp	2019-02-13 13:41:52.179908805 +0200

@@ -72,4 +72,5 @@

 	}

 #endif

 	tmpfile_error("failed to create temporary file");

+	return NULL;

 }