react-selectize TypeError: Cannot read property 'position' of undefined when using [tether] option

Do you want to request a feature or report a bug? Bug What is the current behavior? Create a SimpleSelect component with tether option. Try to chose any item option - error TypeError: Cannot read property 'position' of undefined appears.

class TestSelect extends Component {
  state = {
    options: ["apple", "mango", "grapes", "melon", "strawberry"].map(fruit => ({ label: fruit, value: fruit }))
  }

  render() {
    return (
      <div style={{ border: '1px solid black', height: 200, overflow: "auto", padding: 20 }}>
       <div style={{ padding: 20 }}>
          Lorem ipsum dolor sit amet, consectetur adipiscing elit
       </div>

        <SimpleSelect
          options={this.state.options}
          placeholder="Select a fruit"
          theme="bootstrap3"
          hideResetButton
          tether={true}
          placeholder="Select a fruit"
          >
        </SimpleSelect>

       <div style={{ padding: 20 }}>
          Fusce aliquet dui tortor, imperdiet viverra augue pretium nec
       </div>
      </div>
    )
  }
}

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem: Select SimpleSelect component and try to chose any option. Demo issue: https://codesandbox.io/s/j26ojv34kw Gif: What is the expected behavior? After choosing any option with enabled tether option - select should not throwing error. Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React? React 16.0.0 Note: This demo will work with React v.15.4.2+, but I catched few times this issue also, but can't create an always-reproduce code to test. Chrome 63.0.3239.84 Win10 P.S. Seems the same issue https://github.com/furqanZafar/react-selectize/issues/189, just create a more reliable ticket.