diff --git a/Salmon.Web/TripletJsonConverter.cs b/Salmon.Web/TripletJsonConverter.cs
index 18ed313..0d119c3 100644
--- a/Salmon.Web/TripletJsonConverter.cs
+++ b/Salmon.Web/TripletJsonConverter.cs
@@ -22,6 +22,10 @@ public class TripletJsonConverter
             string jsonkey = reader.GetString();
             Debug.Assert(reader.Read());
 
+            Debug.Assert(reader.TokenType != JsonTokenType.EndObject);
+            Debug.Assert(reader.TokenType != JsonTokenType.EndArray);
+            Debug.Assert(reader.TokenType != JsonTokenType.PropertyName);
+
             if(jsonkey.ToLower() == nameof(Triplet.key).ToLower())
             {
                 Debug.Assert(reader.TokenType == JsonTokenType.String);