diff --git a/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py b/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py
index 7bce5ba3..d7694e90 100644
--- a/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py
+++ b/examples/starwars_relay/tests/snapshots/snap_test_objectidentification.py
@@ -49,7 +49,7 @@ type Faction implements Node {
   name: String
 
   """The ships used by the faction."""
-  ships(before: String = null, after: String = null, first: Int = null, last: Int = null): ShipConnection
+  ships(before: String, after: String, first: Int, last: Int): ShipConnection
 }
 
 """An object with an ID"""
diff --git a/graphene/relay/node.py b/graphene/relay/node.py
index c1316d22..dabcff6c 100644
--- a/graphene/relay/node.py
+++ b/graphene/relay/node.py
@@ -86,6 +86,8 @@ class Node(AbstractNode):
     def get_node_from_global_id(cls, info, global_id, only_type=None):
         try:
             _type, _id = cls.from_global_id(global_id)
+            if not _type:
+                raise ValueError("Invalid Global ID")
         except Exception as e:
             raise Exception(
                 f'Unable to parse global ID "{global_id}". '
diff --git a/graphene/tests/issues/test_1394.py b/graphene/tests/issues/test_1394.py
new file mode 100644
index 00000000..39374381
--- /dev/null
+++ b/graphene/tests/issues/test_1394.py
@@ -0,0 +1,36 @@
+from ...types import ObjectType, Schema, String, NonNull
+
+
+class Query(ObjectType):
+    hello = String(input=NonNull(String))
+
+    def resolve_hello(self, info, input):
+        if input == "nothing":
+            return None
+        return f"Hello {input}!"
+
+
+schema = Schema(query=Query)
+
+
+def test_required_input_provided():
+    """
+    Test that a required argument works when provided.
+    """
+    input_value = "Potato"
+    result = schema.execute('{ hello(input: "%s") }' % input_value)
+    assert not result.errors
+    assert result.data == {"hello": "Hello Potato!"}
+
+
+def test_required_input_missing():
+    """
+    Test that a required argument raised an error if not provided.
+    """
+    result = schema.execute("{ hello }")
+    assert result.errors
+    assert len(result.errors) == 1
+    assert (
+        result.errors[0].message
+        == "Field 'hello' argument 'input' of type 'String!' is required, but it was not provided."
+    )
diff --git a/graphene/types/argument.py b/graphene/types/argument.py
index 71026d45..f9dc843b 100644
--- a/graphene/types/argument.py
+++ b/graphene/types/argument.py
@@ -1,4 +1,5 @@
 from itertools import chain
+from graphql import Undefined
 
 from .dynamic import Dynamic
 from .mountedtype import MountedType
@@ -41,7 +42,7 @@ class Argument(MountedType):
     def __init__(
         self,
         type_,
-        default_value=None,
+        default_value=Undefined,
         description=None,
         name=None,
         required=False,
diff --git a/graphene/types/tests/test_query.py b/graphene/types/tests/test_query.py
index 2d3e4c73..e117754f 100644
--- a/graphene/types/tests/test_query.py
+++ b/graphene/types/tests/test_query.py
@@ -229,11 +229,11 @@ def test_query_arguments():
 
     result = test_schema.execute("{ test }", None)
     assert not result.errors
-    assert result.data == {"test": '[null,{"a_str":null,"a_int":null}]'}
+    assert result.data == {"test": "[null,{}]"}
 
     result = test_schema.execute('{ test(aStr: "String!") }', "Source!")
     assert not result.errors
-    assert result.data == {"test": '["Source!",{"a_str":"String!","a_int":null}]'}
+    assert result.data == {"test": '["Source!",{"a_str":"String!"}]'}
 
     result = test_schema.execute('{ test(aInt: -123, aStr: "String!") }', "Source!")
     assert not result.errors
@@ -258,7 +258,7 @@ def test_query_input_field():
 
     result = test_schema.execute("{ test }", None)
     assert not result.errors
-    assert result.data == {"test": '[null,{"a_input":null}]'}
+    assert result.data == {"test": "[null,{}]"}
 
     result = test_schema.execute('{ test(aInput: {aField: "String!"} ) }', "Source!")
     assert not result.errors
diff --git a/graphene/types/tests/test_type_map.py b/graphene/types/tests/test_type_map.py
index 12e7a1f4..f0c78e08 100644
--- a/graphene/types/tests/test_type_map.py
+++ b/graphene/types/tests/test_type_map.py
@@ -1,3 +1,4 @@
+from graphql import Undefined
 from graphql.type import (
     GraphQLArgument,
     GraphQLEnumType,
@@ -244,7 +245,9 @@ def test_objecttype_camelcase():
     foo_field = fields["fooBar"]
     assert isinstance(foo_field, GraphQLField)
     assert foo_field.args == {
-        "barFoo": GraphQLArgument(GraphQLString, default_value=None, out_name="bar_foo")
+        "barFoo": GraphQLArgument(
+            GraphQLString, default_value=Undefined, out_name="bar_foo"
+        )
     }
 
 
@@ -267,7 +270,7 @@ def test_objecttype_camelcase_disabled():
     assert isinstance(foo_field, GraphQLField)
     assert foo_field.args == {
         "bar_foo": GraphQLArgument(
-            GraphQLString, default_value=None, out_name="bar_foo"
+            GraphQLString, default_value=Undefined, out_name="bar_foo"
         )
     }
 
diff --git a/graphene/utils/tests/test_deduplicator.py b/graphene/utils/tests/test_deduplicator.py
index b845caf1..95a70e74 100644
--- a/graphene/utils/tests/test_deduplicator.py
+++ b/graphene/utils/tests/test_deduplicator.py
@@ -94,6 +94,7 @@ TEST_DATA = {
     ],
     "movies": {
         "1198359": {
+            "id": "1198359",
             "name": "King Arthur: Legend of the Sword",
             "synopsis": (
                 "When the child Arthur's father is murdered, Vortigern, "
@@ -159,7 +160,7 @@ def test_example_end_to_end():
                 "date": "2017-05-19",
                 "movie": {
                     "__typename": "Movie",
-                    "id": "TW92aWU6Tm9uZQ==",
+                    "id": "TW92aWU6MTE5ODM1OQ==",
                     "name": "King Arthur: Legend of the Sword",
                     "synopsis": (
                         "When the child Arthur's father is murdered, Vortigern, "
@@ -172,7 +173,7 @@ def test_example_end_to_end():
                 "__typename": "Event",
                 "id": "RXZlbnQ6MjM0",
                 "date": "2017-05-20",
-                "movie": {"__typename": "Movie", "id": "TW92aWU6Tm9uZQ=="},
+                "movie": {"__typename": "Movie", "id": "TW92aWU6MTE5ODM1OQ=="},
             },
         ]
     }