fixes to slm, @everyone copyme and slm

NadekoBot/Classes/Music/MusicControls.cs

@@ -49,9 +49,10 @@ namespace NadekoBot.Classes.Music {
             lock (_voiceLock) {
                 CurrentSong?.Stop();
                 CurrentSong = null;
-                if (SongQueue.Count == 0) return;
-                CurrentSong = SongQueue[0];
-                SongQueue.RemoveAt(0);
+                if (SongQueue.Count != 0) {
+                    CurrentSong = SongQueue[0];
+                    SongQueue.RemoveAt(0);
+                } else return;
             }
 
             try {
@@ -69,9 +70,9 @@ namespace NadekoBot.Classes.Music {
                     if(kvp != null)
                         kvp.Cancel();
                 }
-                SongQueue.Clear();
+                SongQueue?.Clear();
                 LoadNextSong();
-                VoiceClient.Disconnect();
+                VoiceClient?.Disconnect();
                 VoiceClient = null;
             }
         }

NadekoBot/Classes/Music/StreamRequest.cs

@@ -168,7 +168,7 @@ namespace NadekoBot.Classes.Music {
                         Task.Run(() => bufferCancelSource.Cancel());
                     }
 
-                    await Task.Delay(50);
+                    await Task.Delay(500);
                 }
 
                 if (State == StreamState.Completed) {