Crash if entered repeating numbers

![192901626014520_ pic](https://user-images.githubusercontent.com/52874216/125200438-c18e3f80-e29d-11eb-8b59-e98156c78ab3.jpg)
如果是四个不重复的数字就OK

![192931626014542_ pic](https://user-images.githubusercontent.com/52874216/125200456-dbc81d80-e29d-11eb-88dc-e231e5ee67e5.jpg)
重复的数字就不行

Discovered by @Lama3L9R