  def testGetSessionHandle(self):
    if context.executing_eagerly():
      with self.assertRaisesRegex(
          errors.FailedPreconditionError,
          "GetSessionHandle called on null session state"):
        gen_data_flow_ops.GetSessionHandle(value=[1])
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.