--- icu.orig/source/layout/OpenTypeLayoutEngine.cpp	2007-12-11 11:18:20.000000000 +0000
+++ icu/source/layout/OpenTypeLayoutEngine.cpp	2007-12-11 11:19:22.000000000 +0000
@@ -338,7 +338,9 @@
     for (le_int32 g = 0; g < glyphCount; g += 1) {
         LEGlyphID glyph = glyphStorage[g];
 
-        if (glyph == zwnj) {
+        if (!glyph) {
+            continue;
+        } else if (glyph == zwnj) {
             glyphStorage[g] = LE_SET_GLYPH(glyph, 0xFFFF);
         } else if (glyph == nbsp) {
             glyphStorage[g] = LE_SET_GLYPH(glyph, 0x0003);