diff --git a/lib/pages/analytics/modules/occupancy/widgets/occupancy_heat_map.dart b/lib/pages/analytics/modules/occupancy/widgets/occupancy_heat_map.dart
index 6fd4b259..dd094133 100644
--- a/lib/pages/analytics/modules/occupancy/widgets/occupancy_heat_map.dart
+++ b/lib/pages/analytics/modules/occupancy/widgets/occupancy_heat_map.dart
@@ -15,7 +15,7 @@ class OccupancyHeatMap extends StatelessWidget {
   static const _totalWeeks = 53;
 
   int get _maxValue => heatMapData.isNotEmpty
-      ? heatMapData.keys.map((key) => heatMapData[key]!).reduce(math.max)
+      ? heatMapData.keys.map((key) => heatMapData[key] ?? 0).reduce(math.max)
       : 0;
 
   DateTime _getStartingDate() {