diff --git a/lib/pages/analytics/models/range_of_aqi.dart b/lib/pages/analytics/models/range_of_aqi.dart
index 0308d564..dfb48ecb 100644
--- a/lib/pages/analytics/models/range_of_aqi.dart
+++ b/lib/pages/analytics/models/range_of_aqi.dart
@@ -38,9 +38,9 @@ class RangeOfAqiValue extends Equatable {
   factory RangeOfAqiValue.fromJson(Map<String, dynamic> json) {
     return RangeOfAqiValue(
       type: json['type'] as String,
-      min: (json['min'] as num).toDouble(),
-      average: (json['average'] as num).toDouble(),
-      max: (json['max'] as num).toDouble(),
+      min: (json['min'] as num? ?? 0).toDouble(),
+      average: (json['average'] as num? ?? 0).toDouble(),
+      max: (json['max'] as num? ?? 0).toDouble(),
     );
   }