[mkvegas]

This is a plugin written by Peace-Maker (Websocket) which, as I understand, backs Chat Relay plugin by Arkarr.
There have been almost no updates to any of these, so the recent SM versions have knocked them out:
SM 1.9.0 gives this error when website connects to the gameserver:

L 10/06/2018 - 12:45:53: [SM] Exception reported: Invalid match index passed. L 10/06/2018 - 12:45:53: [SM] Blaming: websocket.smx L 10/06/2018 - 12:45:53: [SM] Call stack trace: L 10/06/2018 - 12:45:53: [SM] [0] GetRegexSubString L 10/06/2018 - 12:45:53: [SM] [1] Line 753, C:\Users\Jannik\Documents\GitHub\sm-websocket\scripting\websocket.sp::OnChildSock etReceive

I am not even a beginner when it comes to coding, so I have no idea how to fix this. Was hoping someone could help me out with this one?