diff --git a/src/DataTypes/Serializations/SerializationTuple.cpp b/src/DataTypes/Serializations/SerializationTuple.cpp
index ec92ceb9110..62b05b1079c 100644
--- a/src/DataTypes/Serializations/SerializationTuple.cpp
+++ b/src/DataTypes/Serializations/SerializationTuple.cpp
@@ -400,6 +400,9 @@ ReturnType SerializationTuple::deserializeTupleJSONImpl(IColumn & column, ReadBu
                     return false;
                 }
 
+                if (seen_elements[element_pos])
+                    throw Exception(ErrorCodes::INCORRECT_DATA, "JSON object contains duplicate key '{}'", name);
+
                 seen_elements[element_pos] = 1;
                 auto & element_column = extractElementColumn(column, element_pos);
 
diff --git a/tests/queries/0_stateless/03284_json_object_as_tuple_duplicate_keys.reference b/tests/queries/0_stateless/03284_json_object_as_tuple_duplicate_keys.reference
new file mode 100644
index 00000000000..4fe371d5dfc
--- /dev/null
+++ b/tests/queries/0_stateless/03284_json_object_as_tuple_duplicate_keys.reference
@@ -0,0 +1,2 @@
+a	Tuple(\n    b Nullable(String))					
+a	Tuple(\n    b Nullable(String))					
diff --git a/tests/queries/0_stateless/03284_json_object_as_tuple_duplicate_keys.sql b/tests/queries/0_stateless/03284_json_object_as_tuple_duplicate_keys.sql
new file mode 100644
index 00000000000..a60b8c9488b
--- /dev/null
+++ b/tests/queries/0_stateless/03284_json_object_as_tuple_duplicate_keys.sql
@@ -0,0 +1,9 @@
+select * from format(JSONEachRow, 'a Tuple(b UInt32)', '{"a" : {"b" : 1, "b" : 2}}'); -- {serverError INCORRECT_DATA}
+select * from format(JSONEachRow, '{"a" : {"b" : 1, "b" : 2}}'); -- {serverError INCORRECT_DATA}
+select * from format(JSONEachRow, '{"a" : {"b" : 1, "b" : 2, "b" : 3}, "c" : 42}'); -- {serverError INCORRECT_DATA}
+set input_format_json_use_string_type_for_ambiguous_paths_in_named_tuples_inference_from_objects=1;
+desc format(JSONEachRow, '{"a" : {"b" : 1, "b" : "Hello"}}');
+select * from format(JSONEachRow, '{"a" : {"b" : 1, "b" : "Hello"}}'); -- {serverError INCORRECT_DATA}
+desc format(JSONEachRow, '{"a" : {"b" : 1, "b" : {"c" : "Hello"}}}');
+select * from format(JSONEachRow, '{"a" : {"b" : 1, "b" : {"c" : "Hello"}}}'); -- {serverError INCORRECT_DATA}
+