[CLIENT] Stuck in queue when cancelling queue and at the same time client found game

Client Version: 6.1.16_01_20_13_46 Windows 10 (Version 1511, build 10586.63) CPU: AMD FX-8320 GPU: AMD Radeon R9 270X

1. While on game solo queue (PvP / Classic / Summoner's Rift 5v5 / Normal Blind Pick)
2. I decided to cancel and return to the main screen.
3. When I clicked the X button, suddenly the "Match Found" popup came up and I clicked "Accept.
4. [Bug here] The "Waiting for other players..." message came up showing that only one player has accepted the match, but the message never changed.
5. So after a few minutes I assumed the client was stuck on that screen so I have to close the whole window and restart the client.