diff --git a/pdf.js b/pdf.js
index 601518f57..e16567c21 100644
--- a/pdf.js
+++ b/pdf.js
@@ -4304,6 +4304,9 @@ var PartialEvaluator = (function() {
             var index = GlyphsUnicode[glyph] || i;
             glyphsMap[glyph] = encodingMap[i] = index;
 
+            if (!fontFile)
+              continue;
+
             if (index <= 0x1f || (index >= 127 && index <= 255))
               glyphsMap[glyph] = encodingMap[i] += kCmapGlyphOffset;
           }