src/main/java/buttondevteam/discordplugin/DiscordConnectedPlayer.java

@@ -19,7 +19,11 @@ public class DiscordConnectedPlayer extends DiscordFakePlayer implements IMCPlay
 
 	public DiscordConnectedPlayer(User user, MessageChannel channel, UUID uuid, String mcname, MinecraftChatModule module) {
 		super(user, channel, nextEntityId++, uuid, mcname, module);
-		vanillaCmdListener = new VanillaCommandListener<>(this);
+		try {
+			vanillaCmdListener = new VanillaCommandListener<>(this);
+		} catch (NoClassDefFoundError e) {
+			DPUtils.getLogger().warning("Vanilla commands won't be available from Discord due to a compatibility error.");
+		}
 	}
 
 }

src/main/java/buttondevteam/discordplugin/DiscordPlayerSender.java

@@ -41,7 +41,11 @@ public class DiscordPlayerSender extends DiscordSenderBase implements IMCPlayer<
 	public DiscordPlayerSender(User user, MessageChannel channel, Player player) {
 		super(user, channel);
 		this.player = player;
-		vanillaCmdListener = new VanillaCommandListener<DiscordPlayerSender>(this);
+		try {
+			vanillaCmdListener = new VanillaCommandListener<DiscordPlayerSender>(this);
+		} catch (NoClassDefFoundError e) {
+			DPUtils.getLogger().warning("Vanilla commands won't be available from Discord due to a compatibility error.");
+		}
 	}
 
 	@Override

src/main/java/buttondevteam/discordplugin/exceptions/ExceptionListenerModule.java

@@ -50,28 +50,28 @@ public class ExceptionListenerModule extends Component<DiscordPlugin> implements
 	private static void SendException(Throwable e, String sourcemessage) {
 		if (instance == null) return;
 		try {
-			Mono<MessageChannel> channel = getChannel();
-			assert channel != null;
-			Mono<Role> coderRole;
-			if (channel instanceof GuildChannel)
-				coderRole = instance.pingRole(((GuildChannel) channel).getGuild()).get();
-			else
-				coderRole = Mono.empty();
-			coderRole.map(role -> TBMCCoreAPI.IsTestServer() ? new StringBuilder()
-				: new StringBuilder(role.getMention()).append("\n"))
-				.defaultIfEmpty(new StringBuilder())
-				.flatMap(sb -> {
-					sb.append(sourcemessage).append("\n");
-					sb.append("```").append("\n");
-					String stackTrace = Arrays.stream(ExceptionUtils.getStackTrace(e).split("\\n"))
-						.filter(s -> !s.contains("\tat ") || s.contains("\tat buttondevteam."))
-						.collect(Collectors.joining("\n"));
-					if (sb.length() + stackTrace.length() >= 1980)
-						stackTrace = stackTrace.substring(0, 1980 - sb.length());
-					sb.append(stackTrace).append("\n");
-					sb.append("```");
-					return channel.flatMap(ch -> ch.createMessage(sb.toString()));
-				}).subscribe();
+			getChannel().flatMap(channel -> {
+				Mono<Role> coderRole;
+				if (channel instanceof GuildChannel)
+					coderRole = instance.pingRole(((GuildChannel) channel).getGuild()).get();
+				else
+					coderRole = Mono.empty();
+				return coderRole.map(role -> TBMCCoreAPI.IsTestServer() ? new StringBuilder()
+					: new StringBuilder(role.getMention()).append("\n"))
+					.defaultIfEmpty(new StringBuilder())
+					.flatMap(sb -> {
+						sb.append(sourcemessage).append("\n");
+						sb.append("```").append("\n");
+						String stackTrace = Arrays.stream(ExceptionUtils.getStackTrace(e).split("\\n"))
+							.filter(s -> !s.contains("\tat ") || s.contains("\tat buttondevteam."))
+							.collect(Collectors.joining("\n"));
+						if (sb.length() + stackTrace.length() >= 1980)
+							stackTrace = stackTrace.substring(0, 1980 - sb.length());
+						sb.append(stackTrace).append("\n");
+						sb.append("```");
+						return channel.createMessage(sb.toString());
+					});
+			}).subscribe();
 		} catch (Exception ex) {
 			ex.printStackTrace();
 		}

src/main/java/buttondevteam/discordplugin/mcchat/MCChatListener.java

@@ -321,7 +321,8 @@ public class MCChatListener implements Listener {
 					return;
 				}
 				val ev = new TBMCCommandPreprocessEvent(dsender, dmessage);
-				Bukkit.getPluginManager().callEvent(ev);
+				Bukkit.getScheduler().runTask(DiscordPlugin.plugin, () ->
+					Bukkit.getPluginManager().callEvent(ev));
 				if (ev.isCancelled())
 					return;
 				int spi = cmdlowercased.indexOf(' ');
@@ -338,7 +339,11 @@ public class MCChatListener implements Listener {
 							if (clmd != null) {
 								channel.set(clmd.mcchannel); //Hack to send command in the channel
 							} //TODO: Permcheck isn't implemented for commands
-							VanillaCommandListener.runBukkitOrVanillaCommand(dsender, cmd);
+							try {
+								VanillaCommandListener.runBukkitOrVanillaCommand(dsender, cmd);
+							} catch (NoClassDefFoundError e) {
+								Bukkit.dispatchCommand(dsender, cmd);
+							}
 							Bukkit.getLogger().info(dsender.getName() + " issued command from Discord: /" + cmdlowercased);
 							if (clmd != null)
 								channel.set(chtmp);