when input some IME punctuation, the editor crashs

[psybor]

Do you want to request a feature or report a bug?

bug

What is the current behavior?

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. You can use this jsfiddle to get started: https://jsfiddle.net/gmertk/e61z7nfa/.

1. input "。。"
2. press enter to swich to line two.
3. input "。。"
4. press ctrl + z to perform an undo.
5. crash.

What is the expected behavior?

not crash

Which versions of Draft.js, and which browser / OS are affected by this issue? Did this work in previous versions of Draft.js?

draft-js: 0.11.7.
os: windows 10.
broswer: latest chrome.