diff --git a/Src/Newtonsoft.Json.Tests/Serialization/ContractResolverTests.cs b/Src/Newtonsoft.Json.Tests/Serialization/ContractResolverTests.cs
index 1cee6b3f..124b5636 100644
--- a/Src/Newtonsoft.Json.Tests/Serialization/ContractResolverTests.cs
+++ b/Src/Newtonsoft.Json.Tests/Serialization/ContractResolverTests.cs
@@ -186,7 +186,7 @@ namespace Newtonsoft.Json.Tests.Serialization
 
             Assert.IsFalse(contract.IsInstantiable);
             Assert.IsNull(contract.DefaultCreator);
-            Assert.IsNull(contract.ParametrizedCreator);
+            Assert.IsFalse(contract.HasParametrizedCreator);
 
             ExceptionAssert.Throws<JsonSerializationException>(
                 "Could not create an instance of type Newtonsoft.Json.Tests.Serialization.AbstractListTestClass`1[System.Int32]. Type is an interface or abstract class and cannot be instantiated. Path '', line 1, position 1.",
@@ -268,7 +268,7 @@ namespace Newtonsoft.Json.Tests.Serialization
 
             Assert.IsFalse(contract.IsInstantiable);
             Assert.IsNull(contract.DefaultCreator);
-            Assert.IsNull(contract.ParametrizedCreator);
+            Assert.IsFalse(contract.HasParametrizedCreator);
 
             ExceptionAssert.Throws<JsonSerializationException>(
                 "Could not create an instance of type Newtonsoft.Json.Tests.Serialization.AbstractDictionaryTestClass`2[System.String,System.Int32]. Type is an interface or abstract class and cannot be instantiated. Path 'key1', line 1, position 6.",
diff --git a/Src/Newtonsoft.Json/Serialization/JsonArrayContract.cs b/Src/Newtonsoft.Json/Serialization/JsonArrayContract.cs
index e5f540be..cc9d89ae 100644
--- a/Src/Newtonsoft.Json/Serialization/JsonArrayContract.cs
+++ b/Src/Newtonsoft.Json/Serialization/JsonArrayContract.cs
@@ -75,12 +75,7 @@ namespace Newtonsoft.Json.Serialization
             get
             {
                 if (_parametrizedCreator == null)
-                {
-                    if (_parametrizedConstructor == null)
-                        return null;
-
                     _parametrizedCreator = JsonTypeReflector.ReflectionDelegateFactory.CreateParametrizedConstructor(_parametrizedConstructor);
-                }
 
                 return _parametrizedCreator;
             }
@@ -158,7 +153,7 @@ namespace Newtonsoft.Json.Serialization
                 _genericCollectionDefinitionType = typeof(List<>).MakeGenericType(CollectionItemType);
                 _parametrizedConstructor = CollectionUtils.ResolveEnumerableCollectionConstructor(CreatedType, CollectionItemType);
                 IsReadOnlyOrFixedSize = true;
-                canDeserialize = (ParametrizedCreator != null);
+                canDeserialize = HasParametrizedCreator;
             }
 #endif
             else if (ReflectionUtils.ImplementsGenericDefinition(underlyingType, typeof(IEnumerable<>), out tempCollectionType))
@@ -171,7 +166,7 @@ namespace Newtonsoft.Json.Serialization
                 _parametrizedConstructor = CollectionUtils.ResolveEnumerableCollectionConstructor(underlyingType, CollectionItemType);
 
 #if !(NET35 || NET20 || NETFX_CORE)
-                if (ParametrizedCreator == null && underlyingType.Name == FSharpUtils.FSharpListTypeName)
+                if (!HasParametrizedCreator && underlyingType.Name == FSharpUtils.FSharpListTypeName)
                 {
                     FSharpUtils.EnsureInitialized(underlyingType.Assembly());
                     _parametrizedCreator = FSharpUtils.CreateSeq(CollectionItemType);
@@ -192,7 +187,7 @@ namespace Newtonsoft.Json.Serialization
 
                     IsReadOnlyOrFixedSize = true;
                     ShouldCreateWrapper = true;
-                    canDeserialize = (ParametrizedCreator != null);
+                    canDeserialize = HasParametrizedCreator;
                 }
             }
             else
diff --git a/Src/Newtonsoft.Json/Serialization/JsonDictionaryContract.cs b/Src/Newtonsoft.Json/Serialization/JsonDictionaryContract.cs
index 5da22eb3..191fec2f 100644
--- a/Src/Newtonsoft.Json/Serialization/JsonDictionaryContract.cs
+++ b/Src/Newtonsoft.Json/Serialization/JsonDictionaryContract.cs
@@ -78,12 +78,7 @@ namespace Newtonsoft.Json.Serialization
             get
             {
                 if (_parametrizedCreator == null)
-                {
-                    if (_parametrizedConstructor == null)
-                        return null;
-
                     _parametrizedCreator = JsonTypeReflector.ReflectionDelegateFactory.CreateParametrizedConstructor(_parametrizedConstructor);
-                }
 
                 return _parametrizedCreator;
             }
@@ -143,7 +138,7 @@ namespace Newtonsoft.Json.Serialization
                 _parametrizedConstructor = CollectionUtils.ResolveEnumerableCollectionConstructor(CreatedType, typeof(KeyValuePair<,>).MakeGenericType(keyType, valueType));
 
 #if !(NET35 || NET20 || NETFX_CORE)
-                if (_parametrizedConstructor == null && underlyingType.Name == FSharpUtils.FSharpMapTypeName)
+                if (!HasParametrizedCreator && underlyingType.Name == FSharpUtils.FSharpMapTypeName)
                 {
                     FSharpUtils.EnsureInitialized(underlyingType.Assembly());
                     _parametrizedCreator = FSharpUtils.CreateMap(keyType, valueType);