diff --git a/lib/from_openstudio/material/window_glazing.rb b/lib/from_openstudio/material/window_glazing.rb
index b1e8658..13b741e 100644
--- a/lib/from_openstudio/material/window_glazing.rb
+++ b/lib/from_openstudio/material/window_glazing.rb
@@ -45,7 +45,12 @@ def self.from_material(material)
             hash[:display_name] = (material.displayName.get).force_encoding("UTF-8")
         end
         hash[:thickness] = material.thickness
-        hash[:solar_transmittance] = material.solarTransmittance
+        # check for the transmittance in begin/rescue in case spectral data is not set
+        begin
+            hash[:solar_transmittance] = material.solarTransmittance
+        rescue
+            return nil
+        end
         # check if boost optional object is empty
         unless material.frontSideSolarReflectanceatNormalIncidence.empty?
             hash[:solar_reflectance] = material.frontSideSolarReflectanceatNormalIncidence.get
diff --git a/lib/from_openstudio/model.rb b/lib/from_openstudio/model.rb
index b27d4a7..3504b1e 100644
--- a/lib/from_openstudio/model.rb
+++ b/lib/from_openstudio/model.rb
@@ -194,7 +194,10 @@ def self.materials_from_model(openstudio_model)
       end
       # Create HB EnergyWindowMaterialGlazing from OpenStudio Material
       openstudio_model.getStandardGlazings.each do |material|
-        result << EnergyWindowMaterialGlazing.from_material(material)
+        mat_hash = EnergyWindowMaterialGlazing.from_material(material)
+        unless mat_hash.nil?
+          result << mat_hash
+        end
       end
       # Create HB EnergyWindowMaterialBlind from OpenStudio Material
       openstudio_model.getBlinds.each do |material|