diff --git a/Lib/gftools/scripts/add_font.py b/Lib/gftools/scripts/add_font.py
index eb03b26dc..9ffd82f17 100755
--- a/Lib/gftools/scripts/add_font.py
+++ b/Lib/gftools/scripts/add_font.py
@@ -169,7 +169,7 @@ def _MakeMetadata(args, is_new):
     subsets = ['menu'] + subsets_in_font
     with ttLib.TTFont(file_family_style_weights[0][0]) as ttfont:
       script = primary_script(ttfont)
-      if script not in ("Latn", "Cyrl", "Grek",):
+      if script is not None and script not in ("Latn", "Cyrl", "Grek",):
         metadata.primary_script = script
 
   metadata.license = font_license