diff --git a/src/NHibernate.Test/Async/NHSpecificTest/GH2614/Fixture.cs b/src/NHibernate.Test/Async/NHSpecificTest/GH2614/Fixture.cs
new file mode 100644
index 00000000000..2b7c0006da0
--- /dev/null
+++ b/src/NHibernate.Test/Async/NHSpecificTest/GH2614/Fixture.cs
@@ -0,0 +1,54 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by AsyncGenerator.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+
+using NUnit.Framework;
+
+namespace NHibernate.Test.NHSpecificTest.GH2614
+{
+	using System.Threading.Tasks;
+	[TestFixture]
+	public class FixtureAsync : BugTestCase
+	{
+		protected override void OnSetUp()
+		{
+			using (var s = OpenSession())
+			using (var t = s.BeginTransaction())
+			{
+				s.Save(new ConcreteClass1 {Name = "C1"});
+				s.Save(new ConcreteClass2 {Name = "C2"});
+				t.Commit();
+			}
+		}
+
+		protected override void OnTearDown()
+		{
+			using (var s = OpenSession())
+			using (var t = s.BeginTransaction())
+			{
+				s.CreateQuery("delete from System.Object").ExecuteUpdate();
+				t.Commit();
+			}
+		}
+
+		[Test]
+		public async Task PolymorphicListReturnsCorrectResultsAsync()
+		{
+			using (var s = OpenSession())
+			using (s.BeginTransaction())
+			{
+				var query = s.CreateQuery(
+					@"SELECT Name FROM NHibernate.Test.NHSpecificTest.GH2614.BaseClass ROOT");
+				query.SetMaxResults(5);
+				var list = await (query.ListAsync());
+				Assert.That(list.Count, Is.EqualTo(2));
+			}
+		}
+	}
+}
diff --git a/src/NHibernate.Test/NHSpecificTest/GH2614/BaseClass.cs b/src/NHibernate.Test/NHSpecificTest/GH2614/BaseClass.cs
new file mode 100644
index 00000000000..07ae632ad07
--- /dev/null
+++ b/src/NHibernate.Test/NHSpecificTest/GH2614/BaseClass.cs
@@ -0,0 +1,8 @@
+namespace NHibernate.Test.NHSpecificTest.GH2614
+{
+	public abstract class BaseClass
+	{
+		public virtual int Id { get; set; }
+		public virtual string Name { get; set; }
+	}
+}
diff --git a/src/NHibernate.Test/NHSpecificTest/GH2614/ConcreteClass1.cs b/src/NHibernate.Test/NHSpecificTest/GH2614/ConcreteClass1.cs
new file mode 100644
index 00000000000..e164a83a07d
--- /dev/null
+++ b/src/NHibernate.Test/NHSpecificTest/GH2614/ConcreteClass1.cs
@@ -0,0 +1,6 @@
+namespace NHibernate.Test.NHSpecificTest.GH2614
+{
+	public class ConcreteClass1 : BaseClass
+	{
+	}
+}
diff --git a/src/NHibernate.Test/NHSpecificTest/GH2614/ConcreteClass2.cs b/src/NHibernate.Test/NHSpecificTest/GH2614/ConcreteClass2.cs
new file mode 100644
index 00000000000..0c5f9f20eb7
--- /dev/null
+++ b/src/NHibernate.Test/NHSpecificTest/GH2614/ConcreteClass2.cs
@@ -0,0 +1,8 @@
+using System.Collections.Generic;
+
+namespace NHibernate.Test.NHSpecificTest.GH2614
+{
+	public class ConcreteClass2 : BaseClass
+	{
+	}
+}
diff --git a/src/NHibernate.Test/NHSpecificTest/GH2614/Fixture.cs b/src/NHibernate.Test/NHSpecificTest/GH2614/Fixture.cs
new file mode 100644
index 00000000000..82876011bae
--- /dev/null
+++ b/src/NHibernate.Test/NHSpecificTest/GH2614/Fixture.cs
@@ -0,0 +1,43 @@
+using NUnit.Framework;
+
+namespace NHibernate.Test.NHSpecificTest.GH2614
+{
+	[TestFixture]
+	public class Fixture : BugTestCase
+	{
+		protected override void OnSetUp()
+		{
+			using (var s = OpenSession())
+			using (var t = s.BeginTransaction())
+			{
+				s.Save(new ConcreteClass1 {Name = "C1"});
+				s.Save(new ConcreteClass2 {Name = "C2"});
+				t.Commit();
+			}
+		}
+
+		protected override void OnTearDown()
+		{
+			using (var s = OpenSession())
+			using (var t = s.BeginTransaction())
+			{
+				s.CreateQuery("delete from System.Object").ExecuteUpdate();
+				t.Commit();
+			}
+		}
+
+		[Test]
+		public void PolymorphicListReturnsCorrectResults()
+		{
+			using (var s = OpenSession())
+			using (s.BeginTransaction())
+			{
+				var query = s.CreateQuery(
+					@"SELECT Name FROM NHibernate.Test.NHSpecificTest.GH2614.BaseClass ROOT");
+				query.SetMaxResults(5);
+				var list = query.List();
+				Assert.That(list.Count, Is.EqualTo(2));
+			}
+		}
+	}
+}
diff --git a/src/NHibernate.Test/NHSpecificTest/GH2614/Mappings.hbm.xml b/src/NHibernate.Test/NHSpecificTest/GH2614/Mappings.hbm.xml
new file mode 100644
index 00000000000..3aaefa26341
--- /dev/null
+++ b/src/NHibernate.Test/NHSpecificTest/GH2614/Mappings.hbm.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
+           namespace="NHibernate.Test.NHSpecificTest.GH2614"
+           assembly="NHibernate.Test"
+>
+  <class name="ConcreteClass1" >
+    <id name="Id">
+      <generator class="increment"/>
+    </id>
+    <property name="Name"/>
+  </class>
+
+  <class name="ConcreteClass2" >
+    <id name="Id">
+      <generator class="increment"/>
+    </id>
+    <property name="Name"/>
+  </class>
+
+</hibernate-mapping>
diff --git a/src/NHibernate/Async/Engine/Query/HQLQueryPlan.cs b/src/NHibernate/Async/Engine/Query/HQLQueryPlan.cs
index f0e5674ea69..a5ced8d10d7 100644
--- a/src/NHibernate/Async/Engine/Query/HQLQueryPlan.cs
+++ b/src/NHibernate/Async/Engine/Query/HQLQueryPlan.cs
@@ -78,7 +78,7 @@ public async Task PerformListAsync(QueryParameters queryParameters, ISessionImpl
 					for (int x = 0; x < size; x++)
 					{
 						object result = tmp[x];
-						if (distinction.Add(result))
+						if (!distinction.Add(result))
 						{
 							continue;
 						}
diff --git a/src/NHibernate/Engine/Query/HQLQueryPlan.cs b/src/NHibernate/Engine/Query/HQLQueryPlan.cs
index eb02c296cea..fd6717a3d33 100644
--- a/src/NHibernate/Engine/Query/HQLQueryPlan.cs
+++ b/src/NHibernate/Engine/Query/HQLQueryPlan.cs
@@ -128,7 +128,7 @@ public void PerformList(QueryParameters queryParameters, ISessionImplementor ses
 					for (int x = 0; x < size; x++)
 					{
 						object result = tmp[x];
-						if (distinction.Add(result))
+						if (!distinction.Add(result))
 						{
 							continue;
 						}