Hi Hans,

this bug was reported a while ago by user Thérèse on
tex.stackexchange.com [1]. The font “Eadui.ttf” [2] causes the
fontloader to access a nil value because the “Anchor-1” table is
sparse (nil at index 3). Test file for Context:

    https://bitbucket.org/phg/lua-la-tex-tests/src/tip/cnt-eadui.tex

Patch attached, though I suspect it covers only the symptoms.

Philipp

[1] http://tex.stackexchange.com/q/195481/14066
[2] Download at http://openfontlibrary.org/font/eadui

diff --git a/tex/context/base/font-otf.lua b/tex/context/base/font-otf.lua
index 302d8ea..de392a9 100644
--- a/tex/context/base/font-otf.lua
+++ b/tex/context/base/font-otf.lua
@@ -2010,7 +2010,11 @@ actions["reorganize glyph anchors"] = function(data,filename,raw) -- when we rep
                     for tag, specification in next, data do
                         for i=1,#specification do
                             local si = specification[i]
-                            specification[i] = { si.x or 0, si.y or 0 }
+                            if si then
+                              specification[i] = { si.x or 0, si.y or 0 }
+                            else
+                              specification[i] = {  }
+                            end
                         end
                     end
                 else

Attachment: pgp7OErflgPnc.pgp
Description: PGP signature

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