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;
 }