just in case

NadekoBot/Commands/TriviaCommand.cs

@@ -12,9 +12,12 @@ namespace NadekoBot.Commands {
 
         public override Func<CommandEventArgs, Task> DoFunc() => async e => {
             TriviaGame trivia;
-            if (!runningTrivias.TryGetValue(e.Server, out trivia)) { 
-                if(runningTrivias.TryAdd(e.Server, new TriviaGame(e)))
+            if (!runningTrivias.TryGetValue(e.Server, out trivia)) {
+                var triviaGame = new TriviaGame(e);
+                if (runningTrivias.TryAdd(e.Server, triviaGame))
                     await e.Channel.SendMessage("**Trivia game started!**\nFirst player to get to 10 points wins! You have 30 seconds per question.\nUse command `tq` if game was started by accident.**");
+                else
+                    await triviaGame.StopGame();
             } else
                 await e.Channel.SendMessage("Trivia game is already running on this server.\n" + trivia.CurrentQuestion);
         };

NadekoBot/Commands/TriviaCommand.cs~RF13c91205.TMP

@@ -0,0 +1,53 @@
+using System;
+using System.Threading.Tasks;
+using Discord.Commands;
+using NadekoBot.Extensions;
+using System.Collections.Concurrent;
+using Discord;
+using TriviaGame = NadekoBot.Classes.Trivia.TriviaGame;
+
+namespace NadekoBot.Commands {
+    class Trivia : DiscordCommand {
+        public static ConcurrentDictionary<Server, TriviaGame> runningTrivias = new ConcurrentDictionary<Server, TriviaGame>();
+
+        public override Func<CommandEventArgs, Task> DoFunc() => async e => {
+            TriviaGame trivia;
+            if (!runningTrivias.TryGetValue(e.Server, out trivia)) { 
+                if(runningTrivias.TryAdd(e.Server, new TriviaGame(e)))
+                    await e.Channel.SendMessage("**Trivia game started!**\nFirst player to get to 10 points wins! You have 30 seconds per question.\nUse command `tq` if game was started by accident.**");
+            } else
+                await e.Channel.SendMessage("Trivia game is already running on this server.\n" + trivia.CurrentQuestion);
+        };
+
+        public override void Init(CommandGroupBuilder cgb) {
+            cgb.CreateCommand("t")
+                .Description("Starts a game of trivia.")
+                .Alias("-t")
+                .Do(DoFunc());
+
+            cgb.CreateCommand("tl")
+                .Description("Shows a current trivia leaderboard.")
+                .Alias("-tl")
+                .Alias("tlb")
+                .Alias("-tlb")
+                .Do(async e=> {
+                    TriviaGame trivia;
+                    if (runningTrivias.TryGetValue(e.Server, out trivia))
+                        await e.Channel.SendMessage(trivia.GetLeaderboard());
+                    else
+                        await e.Channel.SendMessage("No trivia is running on this server.");
+                });
+
+            cgb.CreateCommand("tq")
+                .Description("Quits current trivia after current question.")
+                .Alias("-tq")
+                .Do(async e=> {
+                    TriviaGame trivia;
+                    if (runningTrivias.TryGetValue(e.Server, out trivia)) {
+                        await trivia.StopGame();
+                    } else
+                        await e.Channel.SendMessage("No trivia is running on this server.");
+                });
+        }
+    }
+}