diff --git a/hub/exports/building_energy/insel/insel_monthly_energy_balance.py b/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
index f136509a..e724c445 100644
--- a/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
+++ b/hub/exports/building_energy/insel/insel_monthly_energy_balance.py
@@ -13,14 +13,14 @@ from hub.imports.weather.helpers.weather import Weather
 import hub.helpers.constants as cte
 
 _CONSTRUCTION_CODE = {
-    cte.WALL: '1',
-    cte.GROUND: '2',
-    cte.ROOF: '3',
-    cte.INTERIOR_WALL: '5',
-    cte.GROUND_WALL: '6',
-    cte.ATTIC_FLOOR: '7',
-    cte.INTERIOR_SLAB: '8'
-  }
+  cte.WALL: '1',
+  cte.GROUND: '2',
+  cte.ROOF: '3',
+  cte.INTERIOR_WALL: '5',
+  cte.GROUND_WALL: '6',
+  cte.ATTIC_FLOOR: '7',
+  cte.INTERIOR_SLAB: '8'
+}
 
 
 class InselMonthlyEnergyBalance(Insel):
@@ -35,8 +35,10 @@ class InselMonthlyEnergyBalance(Insel):
       self._insel_files_paths.append(building.name + '.insel')
       file_name_out = building.name + '.out'
       output_path = Path(self._path / file_name_out).resolve()
-      self._contents.append(self.generate_meb_template(building, output_path, self._radiation_calculation_method,
-                                                       self._weather_format))
+      if building.internal_zones is not None:
+        self._contents.append(
+          self.generate_meb_template(building, output_path, self._radiation_calculation_method,self._weather_format)
+        )
     self._export()
 
   def _export(self):
@@ -86,7 +88,7 @@ class InselMonthlyEnergyBalance(Insel):
       total_internal_gain = 0
       for ig in usage.internal_gains:
         total_internal_gain += float(ig.average_internal_gain) * \
-                                (float(ig.convective_fraction) + float(ig.radiative_fraction))
+                               (float(ig.convective_fraction) + float(ig.radiative_fraction))
       parameters.append(f'{total_internal_gain} % BP(12) #2 Internal gains of zone {i + 1}')
       parameters.append(f'{usage.thermal_control.mean_heating_set_point} % BP(13) #3 Heating setpoint temperature '
                         f'zone {i + 1} (degree Celsius)')