about the bug and disconnect from rank queue

I was in the rank queue. When I was ready to go into the section of choosing champions. However I disconnected and I go back to the home page. **Yes, I was forced to quit the rank. ** The note of server said that there was a error. You know what, because this error, I failed my promotional games. I had already won 1 game and lost 1 game. The third game was so important to me because it is a chance to get the next division. That's why I am so angry. I hope RIOT can fix this bug and give me a good explanation.