diff -up texlive-2012/source/texk/web2c/luatexdir/luafontloader/fontforge/fontforge/encoding.c.me texlive-2012/source/texk/web2c/luatexdir/luafontloader/fontforge/fontforge/encoding.c

--- texlive-2012/source/texk/web2c/luatexdir/luafontloader/fontforge/fontforge/encoding.c.me	2018-07-22 10:49:42.862075024 +0200

+++ texlive-2012/source/texk/web2c/luatexdir/luafontloader/fontforge/fontforge/encoding.c	2018-07-22 10:52:00.667236454 +0200

@@ -541,6 +541,8 @@ return( NULL );

 	base = 256;

     else if ( enc->char_cnt<=0x10000 )

 	base = 0x10000;

+    if (base==0)

+return( NULL );

     encoded = galloc(base*sizeof(int));

     memset(encoded,-1,base*sizeof(int));

     unencoded = galloc(sf->glyphcnt*sizeof(int));