When I report with severity error, I get JSON serialization errors for the DOM node

es6.promise.js:116 Uncaught TypeError: Converting circular structure to JSON
    at JSON.stringify (<anonymous>)
    at console.window.console.error (<anonymous>:39:101)
    at es6.promise.js:110
    at module.exports (_perform.js:3)
    at es6.promise.js:104
    at module.exports (_invoke.js:5)
    at queue.(:3000/anonymous function) (http://localhost:3000/main.bundle.js:128224:7)
    at Number.run (_task.js:21)
    at MessagePort.listener (_task.js:25)

Unhandled promise rejection Error: [react-a11y]: Button - You have an `onClick` handler but did not define an `onKeyDown`, `onKeyUp` or `onKeyPress` handler. Add it, and have the "Space" key do the same thing as an `onClick` handler. See 'https://www.w3.org/WAI/GL/wiki/Making_actions_keyboard_accessible_by_using_keyboard_event_handlers_with_WAI-ARIA_controls' for more info. Element: 
  <button aria-controls="gadgetSelectionPanel" aria-expanded="false" type="submit"><div class="md-ink-container"></div><i aria-hidden="true" class="md-icon material-icons icon icon--default button__icon">add</i><span class="button__label">Add Item</span></button>
    at throwError (options.js:96)
    at options.js:146
    at A11y.<anonymous> (a11y.js:190)
    at Suite._callee$ (test.js:229)
    at tryCatch (runtime.js:62)
    at Generator.invoke [as _invoke] (runtime.js:296)
    at Generator.prototype.(:3000/anonymous function) [as next] (http://localhost:3000/main.bundle.js:284032:21)
    at step (asyncToGenerator.js:17)
    at asyncToGenerator.js:28
    at run (es6.promise.js:75)
    at es6.promise.js:92
    at MutationObserver.flush (_microtask.js:18)
    at MutationObserver.nrWrapper ((index):19)

Here is my config:

  a11y(React, ReactDOM, {
    filterFn: (componentName, elementId, msg) => {
      switch (componentName) {
        // Ignore react-md components
        case 'AccessibleFakeButton':
        case 'FieldCell':
        case 'FontIcon':
        case 'Overlay':
        case 'SelectionControl':
        case 'SelectionControlGroup':
        case 'TextField':
        case 'TransitionGroup':
          return false
        default:
          return true
      }
    },
    rules: {
      'aria-role': 'error',
      'aria-unsupported-elements': 'error',
      'click-events-have-key-events': 'error',
      'hidden-uses-tabindex': 'error',
      'img-redundant-alt': 'error',
      'img-uses-alt': 'error',
      'interactive-supports-focus': 'error',
      'label-has-for': 'error',
      'mouse-events-have-key-events': 'error',
      'no-access-key': 'error',
      'no-hash-ref': 'error',
      'no-onchange': 'error',
      'onclick-uses-role': 'error',
      'tabindex-no-positive': 'error',
      'tabindex-uses-button': 'error'
    }
  })

This is in a current version of Chrome on OSX

reactjs / react-a11y

When I report with severity error, I get JSON serialization errors for the DOM node #158