diff --git a/tests/FSharp.Data.GraphQL.IntegrationTests/FSharp.Data.GraphQL.IntegrationTests.fsproj b/tests/FSharp.Data.GraphQL.IntegrationTests/FSharp.Data.GraphQL.IntegrationTests.fsproj
index 5d7e2d00..37391d6b 100644
--- a/tests/FSharp.Data.GraphQL.IntegrationTests/FSharp.Data.GraphQL.IntegrationTests.fsproj
+++ b/tests/FSharp.Data.GraphQL.IntegrationTests/FSharp.Data.GraphQL.IntegrationTests.fsproj
@@ -19,6 +19,7 @@
     <Content Include="integration-introspection.json" />
     <Content Include="reserved_scalar_input_date_introspection.json" />
     <Content Include="reserved_scalar_object_date_introspection.json" />
+    <Content Include="introspection-altered-types.json" />
     <None Include="operation.graphql">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
@@ -30,6 +31,7 @@
     <Compile Include="ReservedScalarNameProviderTests.fs" />
     <Compile Include="LocalProviderTests.fs" />
     <Compile Include="LocalProviderWithOptionalParametersOnlyTests.fs" />
+    <Compile Include="ResponseJsonTests.fs" />
     <Compile Include="SwapiLocalProviderTests.fs" />
     <Compile Include="SwapiRemoteProviderTests.fs" />
   </ItemGroup>
diff --git a/tests/FSharp.Data.GraphQL.IntegrationTests/ResponseJsonTests.fs b/tests/FSharp.Data.GraphQL.IntegrationTests/ResponseJsonTests.fs
new file mode 100644
index 00000000..04fe8fde
--- /dev/null
+++ b/tests/FSharp.Data.GraphQL.IntegrationTests/ResponseJsonTests.fs
@@ -0,0 +1,73 @@
+module FSharp.Data.GraphQL.IntegrationTests.ResponseJsonTests
+
+open System
+open Xunit
+open Helpers
+open FSharp.Data.GraphQL
+open FSharp.Data.GraphQL.Client
+
+// Local provider should be able to be created from local introspection json file.
+// This schema is adjusted to have some less common type names in order to test them.
+type Provider = GraphQLProvider<"introspection.json">
+
+
+[<Fact>]
+let ``Should be able to parse nullable ID``() =
+    let op = Provider.Operation<"""query TestQuery {
+      hero(id:"1000") {
+          id,
+          name,
+          appearsIn,
+          homePlanet,
+          friends {
+            ... on Human {
+              name,
+              id
+            }
+            ... on Droid {
+              name,
+              id
+            }
+          }
+        }
+      }""">
+    let xop = op()
+    let result1 = xop.ParseResult("""{
+       "documentId": 2018203290,
+       "data": {
+         "hero": {
+          "id": "1000",
+          "__typename": "Human",
+          "name": "Luke Skywalker",
+          "appearsIn": [
+            "NewHope",
+            "Empire",
+            "Jedi"
+          ],
+          "homePlanet": "Tatooine",
+          "friends": [
+            {
+              "name": "Han Solo",
+              "id": "1002",
+              "__typename": "Human"
+            },
+            {
+              "name": "Leia Organa",
+              "id": "1003",
+              "__typename": "Human"
+            },
+            {
+              "name": "C-3PO",
+              "id": "2000",
+              "__typename": "Droid"
+            },
+            {
+              "name": "R2-D2",
+              "id": "2001",
+              "__typename": "Droid"
+            }
+          ]
+        }
+       }
+    }""")
+    ()
diff --git a/tests/FSharp.Data.GraphQL.IntegrationTests/introspection.json b/tests/FSharp.Data.GraphQL.IntegrationTests/introspection.json
index a961111f..011dd95d 100644
--- a/tests/FSharp.Data.GraphQL.IntegrationTests/introspection.json
+++ b/tests/FSharp.Data.GraphQL.IntegrationTests/introspection.json
@@ -981,7 +981,7 @@
                     "name": null,
                     "ofType": {
                       "kind": "SCALAR",
-                      "name": "String",
+                      "name": "ID",
                       "ofType": null
                     }
                   },
@@ -1008,7 +1008,7 @@
                     "name": null,
                     "ofType": {
                       "kind": "SCALAR",
-                      "name": "String",
+                      "name": "ID",
                       "ofType": null
                     }
                   },
@@ -1035,7 +1035,7 @@
                     "name": null,
                     "ofType": {
                       "kind": "SCALAR",
-                      "name": "String",
+                      "name": "ID",
                       "ofType": null
                     }
                   },
@@ -1184,7 +1184,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "String",
+                  "name": "ID",
                   "ofType": null
                 }
               },
@@ -1480,7 +1480,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "String",
+                  "name": "ID",
                   "ofType": null
                 }
               },
@@ -1531,7 +1531,7 @@
                 "name": null,
                 "ofType": {
                   "kind": "SCALAR",
-                  "name": "String",
+                  "name": "ID",
                   "ofType": null
                 }
               },
@@ -1601,7 +1601,7 @@
                     "name": null,
                     "ofType": {
                       "kind": "SCALAR",
-                      "name": "String",
+                      "name": "ID",
                       "ofType": null
                     }
                   },
@@ -1688,7 +1688,7 @@
                     "name": null,
                     "ofType": {
                       "kind": "SCALAR",
-                      "name": "String",
+                      "name": "ID",
                       "ofType": null
                     }
                   },
@@ -1862,4 +1862,4 @@
       ]
     }
   }
-}
\ No newline at end of file
+}