diff --git a/VectoCore/VectoCore/Models/Declaration/DeclarationData.cs b/VectoCore/VectoCore/Models/Declaration/DeclarationData.cs
index 2a5899d67573a0c79ac99b201757ada4a1e07ec5..60af99fbdeba20cc9a6ef197e899ab8085fa79f4 100644
--- a/VectoCore/VectoCore/Models/Declaration/DeclarationData.cs
+++ b/VectoCore/VectoCore/Models/Declaration/DeclarationData.cs
@@ -1555,6 +1555,10 @@ namespace TUGraz.VectoCore.Models.Declaration
 				return null;
 			}
 
+			if (entries.Sum(x => x.WeightingFactor).IsEqual(0)) {
+				return null;
+			}
+
 			var fuels = entries.First().FuelData;
 			return new WeightedResult() {
 				AverageSpeed = null,