once I reloaded Rustcord plugin I got this message pop up on the console: 

[DiscordExtension] [Info]: Discord socket connected! [Thread Pool Worker|43]
[DiscordExtension] [Info]: Your bot was found in 1 Guilds! [Thread Pool Worker|45]
[DiscordExtension] [Info]: Discord socket connected! [Thread Pool Worker|35]
[DiscordExtension] [Exception]: WebSocketEventHandler.SocketMessage Please give error message below to Discord Extension Authors. An error occured for: Unknown.
Body{"t":null,"s":null,"op":10,"d":{"heartbeat_interval":41250,"_trace":["[\"gateway-prd-us-east1-d-tb0p\",{\"micros\":0.0}]"]}} [Thread Pool Worker|44] (Object reference not set to an instance of an object)
   at void Oxide.Ext.Discord.WebSockets.DiscordHeartbeatHandler.SetupHeartbeat(float interval)
   at async ValueTask Oxide.Ext.Discord.WebSockets.DiscordWebSocket.OnDiscordHello(GatewayHelloEvent hello)
   at async ValueTask Oxide.Ext.Discord.WebSockets.WebSocketEventHandler.SocketMessage(Snowflake webSocketId, DiscordJsonReader reader)