diff --git a/JpnCardsPokemon.Sdk/Utils/QueryFilter/AttributedQueryFilterBuilder.cs b/JpnCardsPokemon.Sdk/Utils/QueryFilter/AttributedQueryFilterBuilder.cs
index 2d72895..3f94569 100644
--- a/JpnCardsPokemon.Sdk/Utils/QueryFilter/AttributedQueryFilterBuilder.cs
+++ b/JpnCardsPokemon.Sdk/Utils/QueryFilter/AttributedQueryFilterBuilder.cs
@@ -26,7 +26,7 @@ public abstract class AttributedQueryFilterBuilder : IQueryFilterBuilder
 
             var paramName = attribute.ParamName ?? propertyInfo.Name;
             var value = propertyInfo.GetValue(this)?.ToString();
-            if (!string.IsNullOrEmpty(value)) filterBucket.Add(new KeyValuePair<string, string>(paramName, value));
+            if (!string.IsNullOrEmpty(value)) filterBucket.Add(new KeyValuePair<string, string>(paramName, value!));
         }
 
         var filterBuilder = new StringBuilder();
diff --git a/JpnCardsPokemon.Sdk/Utils/QueryFilter/CardQueryFilterBuilder.cs b/JpnCardsPokemon.Sdk/Utils/QueryFilter/CardQueryFilterBuilder.cs
index 813014f..62260b0 100644
--- a/JpnCardsPokemon.Sdk/Utils/QueryFilter/CardQueryFilterBuilder.cs
+++ b/JpnCardsPokemon.Sdk/Utils/QueryFilter/CardQueryFilterBuilder.cs
@@ -46,7 +46,7 @@ public class CardQueryFilterBuilder : AttributedQueryFilterBuilder
     public int? Uuid { get; set; }
 
     /// <summary>
-    ///     Sets a filter for the <see cref="Card.Rarity/>.
+    ///     Sets a filter for the <see cref="Card.Rarity" />.
     /// 
     /// </summary>
     [QueryFilterName("rarity")]