diff --git a/conformance/binary_json_conformance_suite.cc b/conformance/binary_json_conformance_suite.cc
index 48bfa9660f..0275e2e30b 100644
--- a/conformance/binary_json_conformance_suite.cc
+++ b/conformance/binary_json_conformance_suite.cc
@@ -2329,6 +2329,12 @@ void BinaryAndJsonConformanceSuite::RunJsonTestsForNonRepeatedTypes() {
   ExpectParseFailureForJson(
       "OneofFieldDuplicate", REQUIRED,
       R"({"oneofUint32": 1, "oneofString": "test"})");
+  RunValidJsonTest("OneofFieldNullFirst", REQUIRED,
+                   R"({"oneofUint32": null, "oneofString": "test"})",
+                   "oneof_string: \"test\"");
+  RunValidJsonTest("OneofFieldNullSecond", REQUIRED,
+                   R"({"oneofString": "test", "oneofUint32": null})",
+                   "oneof_string: \"test\"");
   // Ensure zero values for oneof make it out/backs.
   TestAllTypesProto3 messageProto3;
   TestAllTypesProto2 messageProto2;
diff --git a/python/google/protobuf/json_format.py b/python/google/protobuf/json_format.py
index c8f5602f36..965614d803 100644
--- a/python/google/protobuf/json_format.py
+++ b/python/google/protobuf/json_format.py
@@ -531,8 +531,9 @@ class _Parser(object):
                            '"{1}" fields.'.format(
                                message.DESCRIPTOR.full_name, name))
         names.append(name)
+        value = js[name]
         # Check no other oneof field is parsed.
-        if field.containing_oneof is not None:
+        if field.containing_oneof is not None and value is not None:
           oneof_name = field.containing_oneof.name
           if oneof_name in names:
             raise ParseError('Message type "{0}" should not have multiple '
@@ -540,7 +541,6 @@ class _Parser(object):
                                  message.DESCRIPTOR.full_name, oneof_name))
           names.append(oneof_name)
 
-        value = js[name]
         if value is None:
           if (field.cpp_type == descriptor.FieldDescriptor.CPPTYPE_MESSAGE
               and field.message_type.full_name == 'google.protobuf.Value'):
diff --git a/src/google/protobuf/util/internal/protostream_objectwriter_test.cc b/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
index 211b7bcbf8..2232bec568 100644
--- a/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
+++ b/src/google/protobuf/util/internal/protostream_objectwriter_test.cc
@@ -699,6 +699,61 @@ TEST_P(ProtoStreamObjectWriterTest, ImplicitMessageList) {
   CheckOutput(expected);
 }
 
+TEST_P(ProtoStreamObjectWriterTest, DisableImplicitMessageList) {
+  options_.disable_implicit_message_list = true;
+  options_.suppress_implicit_message_list_error = true;
+  ResetProtoWriter();
+
+  Book expected;
+  // The repeated friend field of the author is empty.
+  expected.mutable_author();
+
+  EXPECT_CALL(listener_, InvalidValue(_, _, _)).Times(0);
+
+  ow_->StartObject("")
+      ->StartObject("author")
+      ->StartObject("friend")
+      ->RenderString("name", "first")
+      ->EndObject()
+      ->StartObject("friend")
+      ->RenderString("name", "second")
+      ->EndObject()
+      ->EndObject()
+      ->EndObject();
+  CheckOutput(expected);
+}
+
+TEST_P(ProtoStreamObjectWriterTest,
+       DisableImplicitMessageListWithoutErrorSuppressed) {
+  options_.disable_implicit_message_list = true;
+  ResetProtoWriter();
+
+  Book expected;
+  // The repeated friend field of the author is empty.
+  expected.mutable_author();
+  EXPECT_CALL(
+      listener_,
+      InvalidValue(
+          _, StringPiece("friend"),
+          StringPiece(
+              "Starting an object in a repeated field but the parent object "
+              "is not a list")))
+      .With(Args<0>(HasObjectLocation("author")))
+      .Times(2);
+
+  ow_->StartObject("")
+      ->StartObject("author")
+      ->StartObject("friend")
+      ->RenderString("name", "first")
+      ->EndObject()
+      ->StartObject("friend")
+      ->RenderString("name", "second")
+      ->EndObject()
+      ->EndObject()
+      ->EndObject();
+  CheckOutput(expected);
+}
+
 TEST_P(ProtoStreamObjectWriterTest,
        LastWriteWinsOnNonRepeatedMessageFieldWithDuplicates) {
   Book expected;