diff --git a/tensorflow/python/keras/layers/preprocessing/category_encoding.py b/tensorflow/python/keras/layers/preprocessing/category_encoding.py
index 26c8d437c08..128188b09c2 100644
--- a/tensorflow/python/keras/layers/preprocessing/category_encoding.py
+++ b/tensorflow/python/keras/layers/preprocessing/category_encoding.py
@@ -267,12 +267,22 @@ class CategoryEncoding(base_preprocessing_layer.CombinerPreprocessingLayer):
     K.set_value(self.tf_idf_weights, tfidf_data)
 
   def call(self, inputs, count_weights=None):
+    if isinstance(inputs, (list, np.ndarray)):
+      inputs = ops.convert_to_tensor_v2(inputs)
+    if inputs.shape.rank == 1:
+      inputs = array_ops.expand_dims(inputs, 1)
+
     if count_weights is not None and self._output_mode != COUNT:
       raise ValueError("count_weights is not used in `output_mode='tf-idf'`, "
                        "or `output_mode='binary'`. Please pass a single input.")
     self._called = True
     if self._max_tokens is None:
       out_depth = K.get_value(self.num_elements)
+      if out_depth == 0:
+        raise RuntimeError(
+            "If you construct a `CategoryEncoding` layer with "
+            "`max_tokens=None`, you need to call `adapt()` "
+            "on it before using it")
     else:
       out_depth = self._max_tokens
 
@@ -352,6 +362,8 @@ class _CategoryEncodingCombiner(base_preprocessing_layer.Combiner):
 
     # TODO(momernick): Benchmark improvements to this algorithm.
     for element in values:
+      if not isinstance(element, list):
+        element = [element]
       current_doc_id = accumulator.data[self.DOC_ID_IDX]
       for value in element:
         current_max_value = accumulator.data[self.MAX_VALUE_IDX]
diff --git a/tensorflow/python/keras/layers/preprocessing/category_encoding_test.py b/tensorflow/python/keras/layers/preprocessing/category_encoding_test.py
index 048ac3734af..ff1a06a3ae7 100644
--- a/tensorflow/python/keras/layers/preprocessing/category_encoding_test.py
+++ b/tensorflow/python/keras/layers/preprocessing/category_encoding_test.py
@@ -405,6 +405,7 @@ class CategoryEncodingAdaptTest(keras_parameterized.TestCase,
     input_data = keras.Input(shape=(None,), dtype=dtypes.int32)
     layer = get_layer_class()(
         max_tokens=None, output_mode=category_encoding.BINARY)
+    layer.adapt([1, 2])
     _ = layer(input_data)
     with self.assertRaisesRegex(RuntimeError, "num_elements cannot be changed"):
       layer.set_num_elements(5)
@@ -415,6 +416,7 @@ class CategoryEncodingAdaptTest(keras_parameterized.TestCase,
     input_data = keras.Input(shape=(None,), dtype=dtypes.int32)
     layer = get_layer_class()(
         max_tokens=None, output_mode=category_encoding.BINARY)
+    layer.adapt(vocab_data)
     _ = layer(input_data)
     with self.assertRaisesRegex(RuntimeError, "can't be adapted"):
       layer.adapt(vocab_data)
@@ -425,6 +427,7 @@ class CategoryEncodingAdaptTest(keras_parameterized.TestCase,
     input_data = keras.Input(shape=(None,), dtype=dtypes.int32)
     layer = get_layer_class()(
         max_tokens=None, output_mode=category_encoding.BINARY)
+    layer.adapt([1, 2])
     _ = layer(input_data)
     with self.assertRaisesRegex(RuntimeError, "num_elements cannot be changed"):
       layer._set_state_variables(state_variables)
@@ -741,6 +744,21 @@ class CategoryEncodingCombinerTest(
     self.validate_accumulator_computation(combiner, data, expected_accumulator)
     self.validate_accumulator_extract(combiner, data, expected_extract_output)
 
+  def test_1d_data(self):
+    data = [1, 2, 3]
+    cls = get_layer_class()
+    layer = cls()
+    layer.adapt(data)
+    output = layer(data)
+    self.assertListEqual(output.shape.as_list(), [3, 4])
+
+  def test_no_adapt_exception(self):
+    cls = get_layer_class()
+    layer = cls()
+    with self.assertRaisesRegex(
+        RuntimeError, r".*you need to call.*"):
+      _ = layer([1, 2, 3])
+
 
 if __name__ == "__main__":
   test.main()
diff --git a/tensorflow/python/keras/layers/preprocessing/text_vectorization_test.py b/tensorflow/python/keras/layers/preprocessing/text_vectorization_test.py
index 88df3013257..992f47efc85 100644
--- a/tensorflow/python/keras/layers/preprocessing/text_vectorization_test.py
+++ b/tensorflow/python/keras/layers/preprocessing/text_vectorization_test.py
@@ -1037,6 +1037,7 @@ class TextVectorizationOutputTest(
         split=None,
         output_mode=text_vectorization.BINARY,
         pad_to_max_tokens=False)
+    layer.adapt(vocab_data)
     _ = layer(input_data)
     with self.assertRaisesRegex(RuntimeError, "vocabulary cannot be changed"):
       layer.set_vocabulary(vocab_data)
@@ -1054,6 +1055,7 @@ class TextVectorizationOutputTest(
         split=None,
         output_mode=text_vectorization.BINARY,
         pad_to_max_tokens=False)
+    layer.adapt(vocab_data)
     _ = layer(input_data)
     with self.assertRaisesRegex(RuntimeError, "can't be adapted after being"):
       layer.adapt(vocab_data)
@@ -1070,6 +1072,7 @@ class TextVectorizationOutputTest(
         split=None,
         output_mode=text_vectorization.BINARY,
         pad_to_max_tokens=False)
+    layer.adapt(["earth", "wind"])
     _ = layer(input_data)
     with self.assertRaisesRegex(RuntimeError, "vocabulary cannot be changed"):
       layer._set_state_variables(state_variables)