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Showing content from https://github.com/facebook/react/issues/4026 below:

Cannot read property '_currentElement' of null · Issue #4026 · facebook/react · GitHub

Test case: jsFiddle

The error is in this function, internalInstance is null.

  /**
   * Releases any resources allocated by `mountComponent`.
   *
   * @final
   * @internal
   */

  unmountComponent: function(internalInstance) {
    ReactRef.detachRefs(internalInstance, internalInstance._currentElement);
    internalInstance.unmountComponent();
  }

I managed to "fix" the bug by simply checking if internal state is not null but that requires modifying react.
Other mentions of this bug are listed below.

• http://stackoverflow.com/questions/29786154/upgrading-react-to-0-13-2-causes-uncaught-typeerror-cannot-read-property-cu
• Uncaught TypeError: Cannot read property '_currentElement' of null JedWatson/react-select#128
• Loading React more than once is causing context issues w/ react-router.  milankinen/livereactload#8
• https://gist.github.com/jamesknelson/1481521444e1529d59aa

S-Venkat-S, genevieve314 and avindraS-Venkat-S

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