  def testSparseDenseInvalidInputs(self):
    self._testSparseDenseInvalidInputs(
        a_indices=constant_op.constant(0, shape=[17, 2], dtype=dtypes.int64),
        a_values=constant_op.constant(0, shape=[5], dtype=dtypes.float32),
        a_shape=constant_op.constant([3, 4], dtype=dtypes.int64),
        b=constant_op.constant(1, shape=[3, 4], dtype=dtypes.float32),
        expected_error="Dimensions 17 and 5 are not compatible")
    self._testSparseDenseInvalidInputs(
        a_indices=constant_op.constant(0, shape=[17, 4], dtype=dtypes.int64),
        a_values=constant_op.constant(0, shape=[17], dtype=dtypes.float32),
        a_shape=constant_op.constant([3, 4], dtype=dtypes.int64),
        b=constant_op.constant(1, shape=[3, 4], dtype=dtypes.float32),
        expected_error="Dimensions 4 and 2 are not compatible")
    self._testSparseDenseInvalidInputs(
        a_indices=constant_op.constant(7, shape=[17, 2], dtype=dtypes.int64),
        a_values=constant_op.constant(0, shape=[17], dtype=dtypes.float32),
        a_shape=constant_op.constant([3, 4], dtype=dtypes.int64),
        b=constant_op.constant(1, shape=[3, 4], dtype=dtypes.float32),
        expected_error="invalid index")
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.