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