diff --git a/src/UglyToad.PdfPig/PdfFonts/CidFonts/Type0CidFont.cs b/src/UglyToad.PdfPig/PdfFonts/CidFonts/Type0CidFont.cs
index a8324b45..a6a282d8 100644
--- a/src/UglyToad.PdfPig/PdfFonts/CidFonts/Type0CidFont.cs
+++ b/src/UglyToad.PdfPig/PdfFonts/CidFonts/Type0CidFont.cs
@@ -90,6 +90,11 @@
             {
                 throw new ArgumentException($"The provided character identifier was negative: {characterIdentifier}.");
             }
+
+            if (fontProgram == null)
+            {
+                return Descriptor?.BoundingBox ?? new PdfRectangle(0, 0, 1000, 0);
+            }
             
             if (fontProgram.TryGetBoundingBox(characterIdentifier, out var boundingBox))
             {