diff --git a/model_data/app.py b/model_data/app.py
index e6caa5cf..44dcdd69 100644
--- a/model_data/app.py
+++ b/model_data/app.py
@@ -124,4 +124,4 @@ def handler():
     # Internal wall insulation
 
     from model_data.recommendations.WallRecommendations import WallRecommendations
-    self = WallRecommendations(property_instance=input_properties[0])
+    self = WallRecommendations(property_instance=input_properties[1])
diff --git a/model_data/recommendations/WallRecommendations.py b/model_data/recommendations/WallRecommendations.py
index f48b51cb..5269fa4d 100644
--- a/model_data/recommendations/WallRecommendations.py
+++ b/model_data/recommendations/WallRecommendations.py
@@ -144,6 +144,7 @@ class WallRecommendations:
         u_value = self.property.walls["thermal_transmittance"]
 
         is_cavity_wall = self.property.walls["is_cavity_wall"]
+        is_solid_brick = self.property.walls["is_solid_brick"]
 
         if u_value:
             if self.property.walls["thermal_transmittance_unit"] != self.U_VALUE_UNIT: