diff --git a/src/Nest/Aggregations/AggregateFormatter.cs b/src/Nest/Aggregations/AggregateFormatter.cs
index 4885e98df2b..9c7c8236c7d 100644
--- a/src/Nest/Aggregations/AggregateFormatter.cs
+++ b/src/Nest/Aggregations/AggregateFormatter.cs
@@ -419,7 +419,7 @@ private IAggregate GetStatsAggregate(ref JsonReader reader, IReadOnlyDictionary<
 			reader.ReadNext(); // ,
 			reader.ReadNext(); // sum
 			reader.ReadNext(); // :
-			var sum = reader.ReadDouble();
+			var sum = reader.ReadNullableDouble();
 
 			var statsMetric = new StatsAggregate
 			{
diff --git a/src/Nest/Aggregations/Metric/Stats/StatsAggregate.cs b/src/Nest/Aggregations/Metric/Stats/StatsAggregate.cs
index 4713accd5be..33eff2af25c 100644
--- a/src/Nest/Aggregations/Metric/Stats/StatsAggregate.cs
+++ b/src/Nest/Aggregations/Metric/Stats/StatsAggregate.cs
@@ -6,6 +6,6 @@ public class StatsAggregate : MetricAggregateBase
 		public long Count { get; set; }
 		public double? Max { get; set; }
 		public double? Min { get; set; }
-		public double Sum { get; set; }
+		public double? Sum { get; set; }
 	}
 }