diff --git a/GridBlazor/GridBlazor.csproj b/GridBlazor/GridBlazor.csproj
index 4da31ce8..0bc45152 100644
--- a/GridBlazor/GridBlazor.csproj
+++ b/GridBlazor/GridBlazor.csproj
@@ -6,7 +6,7 @@
     <LangVersion>11.0</LangVersion>
     <GenerateEmbeddedFilesManifest>True</GenerateEmbeddedFilesManifest>
     <EnableDefaultEmbeddedResourceItems>False</EnableDefaultEmbeddedResourceItems>
-    <Version>5.0.8</Version>
+    <Version>5.0.9</Version>
     <Title>GridBlazor</Title>
     <Description>Grid components for Blazor</Description>
     <Summary>Grid components for Blazor</Summary>
diff --git a/GridCore/GridCore.csproj b/GridCore/GridCore.csproj
index 7a51bb0b..932bded5 100644
--- a/GridCore/GridCore.csproj
+++ b/GridCore/GridCore.csproj
@@ -7,7 +7,7 @@
     <EnableDefaultEmbeddedResourceItems>False</EnableDefaultEmbeddedResourceItems>
     <Product>GridCore</Product>
     <PackageId>GridCore</PackageId>
-    <Version>7.0.5</Version>
+    <Version>7.0.6</Version>
     <Title>GridCore</Title>
     <Description>Grid core component</Description>
     <Summary>Grid core component</Summary>
diff --git a/GridMvc/GridMvc.csproj b/GridMvc/GridMvc.csproj
index 255256b1..4733520f 100644
--- a/GridMvc/GridMvc.csproj
+++ b/GridMvc/GridMvc.csproj
@@ -8,7 +8,7 @@
     <EnableDefaultEmbeddedResourceItems>False</EnableDefaultEmbeddedResourceItems>
     <Product>GridMvc</Product>
     <PackageId>GridMvcCore</PackageId>
-    <Version>7.0.5</Version>
+    <Version>7.0.6</Version>
     <Title>GridMvc</Title>
     <Description>ASP.NET MVC Grid component</Description>
     <Summary>ASP.NET MVC Grid component</Summary>
diff --git a/GridShared/Filtering/Types/FilterTypeBase.cs b/GridShared/Filtering/Types/FilterTypeBase.cs
index 3166bfde..c541b10e 100644
--- a/GridShared/Filtering/Types/FilterTypeBase.cs
+++ b/GridShared/Filtering/Types/FilterTypeBase.cs
@@ -82,18 +82,17 @@ protected Expression GetFilterExpression<T, S>(Expression leftExpr, string value
                 case GridFilterType.GreaterThanOrEquals:
                     return Expression.GreaterThanOrEqual(leftExpr, valueExpr);
                 case GridFilterType.IsDuplicated:
-                    Expression groupBy = GetGroupBy<T, S>(source, leftExpr);
+                    Expression groupBy = GetDuplicatedGroupBy<T, S>(source, leftExpr);
                     MethodInfo methodInfo = typeof(Queryable).GetMethods()
                         .Single(r => r.Name == "Contains" && r.GetParameters().Length == 2)
                         .MakeGenericMethod(new Type[] { typeof(S) });
                     return Expression.Call(methodInfo, groupBy, leftExpr);
                 case GridFilterType.IsNotDuplicated:
-                    groupBy = GetGroupBy<T, S>(source, leftExpr);
+                    groupBy = GetNotDuplicatedGroupBy<T, S>(source, leftExpr);
                     methodInfo = typeof(Queryable).GetMethods()
                         .Single(r => r.Name == "Contains" && r.GetParameters().Length == 2)
                         .MakeGenericMethod(new Type[] { typeof(S) });
-                    var expresion = Expression.Call(methodInfo, groupBy, leftExpr);
-                    return Expression.Not(expresion);
+                    return Expression.Call(methodInfo, groupBy, leftExpr);
                 default:
                     throw new ArgumentOutOfRangeException();
             }
@@ -101,7 +100,7 @@ protected Expression GetFilterExpression<T, S>(Expression leftExpr, string value
 
         #endregion
 
-        protected Expression GetGroupBy<T, S>(Expression source, Expression expression)
+        protected Expression GetDuplicatedGroupBy<T, S>(Expression source, Expression expression)
         {
             if (expression == null)
                 return null;
@@ -146,6 +145,51 @@ protected Expression GetGroupBy<T, S>(Expression source, Expression expression)
             return binaryExpression;
         }
 
+        protected Expression GetNotDuplicatedGroupBy<T, S>(Expression source, Expression expression)
+        {
+            if (expression == null)
+                return null;
+
+            List<string> names = new List<string>();
+            while (expression.NodeType != ExpressionType.Parameter)
+            {
+                names.Add(((MemberExpression)expression).Member.Name);
+                expression = ((MemberExpression)expression).Expression;
+            }
+
+            Type entityType = typeof(T);
+            ParameterExpression parameter = Expression.Parameter(entityType, "c");
+
+            Expression binaryExpression = parameter;
+            for (int i = names.Count - 1; i >= 0; i--)
+            {
+                binaryExpression = Expression.Property(binaryExpression, names[i]);
+            }
+
+            var selector = Expression.Lambda<Func<T, S>>(binaryExpression, parameter);
+
+            var methodInfo = typeof(Queryable).GetMethods()
+                .Single(r => r.Name == "GroupBy" && r.GetParameters().Length == 2)
+                .MakeGenericMethod(new Type[] { typeof(T), typeof(S) });
+            binaryExpression = Expression.Call(methodInfo, source, selector);
+
+            methodInfo = typeof(Queryable).GetMethods()
+                .Where(r => r.Name == "Where" && r.GetParameters().Length == 2)
+                .First()
+                .MakeGenericMethod(new Type[] { typeof(IGrouping<S, T>) }); ;
+            Expression<Func<IGrouping<S, T>, bool>> having = c => c.Count() <= 1;
+            binaryExpression = Expression.Call(methodInfo, binaryExpression, having);
+
+            methodInfo = typeof(Queryable).GetMethods()
+                .Where(r => r.Name == "Select" && r.GetParameters().Length == 2)
+                .First()
+                .MakeGenericMethod(new Type[] { typeof(IGrouping<S, T>), typeof(S) });
+            Expression<Func<IGrouping<S, T>, S>> select = c => c.Key;
+            binaryExpression = Expression.Call(methodInfo, binaryExpression, select);
+
+            return binaryExpression;
+        }
+
         #region OData
 
         public virtual string GetFilterExpression(string columnName, string value, GridFilterType filterType)
diff --git a/GridShared/Filtering/Types/GuidFilterType.cs b/GridShared/Filtering/Types/GuidFilterType.cs
index ab6649c6..e95ff70b 100644
--- a/GridShared/Filtering/Types/GuidFilterType.cs
+++ b/GridShared/Filtering/Types/GuidFilterType.cs
@@ -73,19 +73,18 @@ public override Expression GetFilterExpression<T>(Expression leftExpr, string va
                     binaryExpression = GetCaseInsensitiveСomparation("EndsWith", toStringLeftExpr, valueExpr);
                     break;
                 case GridFilterType.IsDuplicated:
-                    Expression groupBy = GetGroupBy<T, Guid>(source, leftExpr);
+                    Expression groupBy = GetDuplicatedGroupBy<T, Guid>(source, leftExpr);
                     MethodInfo methodInfo = typeof(Queryable).GetMethods()
                         .Single(r => r.Name == "Contains" && r.GetParameters().Length == 2)
                         .MakeGenericMethod(new Type[] { typeof(Guid) });
                     binaryExpression = Expression.Call(methodInfo, groupBy, toStringLeftExpr);
                     break;
                 case GridFilterType.IsNotDuplicated:
-                    groupBy = GetGroupBy<T, Guid>(source, leftExpr);
+                    groupBy = GetNotDuplicatedGroupBy<T, Guid>(source, leftExpr);
                     methodInfo = typeof(Queryable).GetMethods()
                         .Single(r => r.Name == "Contains" && r.GetParameters().Length == 2)
                         .MakeGenericMethod(new Type[] { typeof(Guid) });
-                    var expresion = Expression.Call(methodInfo, groupBy, toStringLeftExpr);
-                    binaryExpression = Expression.Not(expresion);
+                    binaryExpression = Expression.Call(methodInfo, groupBy, toStringLeftExpr);
                     break;
                 default:
                     throw new ArgumentOutOfRangeException();
diff --git a/GridShared/Filtering/Types/TextFilterType.cs b/GridShared/Filtering/Types/TextFilterType.cs
index cff32a1d..6e05ce06 100644
--- a/GridShared/Filtering/Types/TextFilterType.cs
+++ b/GridShared/Filtering/Types/TextFilterType.cs
@@ -73,19 +73,18 @@ public override Expression GetFilterExpression<T>(Expression leftExpr, string va
                     binaryExpression = GetCaseInsensitiveСomparation("EndsWith", leftExpr, valueExpr, removeDiacritics);
                     break;
                 case GridFilterType.IsDuplicated:
-                    Expression groupBy = GetGroupBy<T, string>(source, leftExpr);
+                    Expression groupBy = GetDuplicatedGroupBy<T, string>(source, leftExpr);
                     MethodInfo methodInfo = typeof(Queryable).GetMethods()
                         .Single(r => r.Name == "Contains" && r.GetParameters().Length == 2)
                         .MakeGenericMethod(new Type[] { typeof(string) });
                     binaryExpression = Expression.Call(methodInfo, groupBy, leftExpr);
                     break;
                 case GridFilterType.IsNotDuplicated:
-                    groupBy = GetGroupBy<T, string>(source, leftExpr);
+                    groupBy = GetNotDuplicatedGroupBy<T, string>(source, leftExpr);
                     methodInfo = typeof(Queryable).GetMethods()
                         .Single(r => r.Name == "Contains" && r.GetParameters().Length == 2)
                         .MakeGenericMethod(new Type[] { typeof(string) });
-                    var expresion = Expression.Call(methodInfo, groupBy, leftExpr);
-                    binaryExpression = Expression.Not(expresion);
+                    binaryExpression = Expression.Call(methodInfo, groupBy, leftExpr);
                     break;
                 default:
                     throw new ArgumentOutOfRangeException();
diff --git a/GridShared/GridShared.csproj b/GridShared/GridShared.csproj
index 03ae107a..602c7217 100644
--- a/GridShared/GridShared.csproj
+++ b/GridShared/GridShared.csproj
@@ -3,7 +3,7 @@
   <PropertyGroup>
     <TargetFrameworks>netstandard2.1;net5.0;net6.0;net7.0;net8.0</TargetFrameworks>
     <LangVersion>11.0</LangVersion>
-    <Version>7.0.4</Version>
+    <Version>7.0.5</Version>
     <Title>GridShared</Title>
     <Description>Support library for GridBlazor and GridMvcCore component libraries</Description>
     <Summary>Support library for GridBlazor and GridMvcCore component libraries</Summary>