fix: stopping stuff in Main and IRCPlugin

src/main/java/me/chayapak1/chomens_bot/Main.java

@@ -43,6 +43,8 @@ public class Main {
 
     private static boolean alreadyStarted = false;
 
+    private static boolean stopping = false;
+
     private static final List<Thread> alreadyAddedThreads = new ArrayList<>();
 
     private static JDA jda = null;
@@ -187,6 +189,10 @@ public class Main {
 
     // most of these are stolen from HBot
     public static void stop () {
+        if (stopping) return;
+
+        stopping = true;
+
         executor.shutdown();
 
         PersistentDataUtilities.stop();
@@ -215,9 +221,7 @@ public class Main {
                 bot.discord.sendMessageInstantly("Stopping..", channelId);
             }
 
-            if (ircEnabled) {
-                bot.irc.quit("Stopping..");
-            }
+            if (ircEnabled) bot.irc.quit("Stopping..");
 
             bot.stop();
         }

src/main/java/me/chayapak1/chomens_bot/plugins/IRCPlugin.java

@@ -169,7 +169,7 @@ public class IRCPlugin extends ListenerAdapter {
     }
 
     public void quit (String reason) {
-        bot.sendIRC().quitServer(reason);
+        if (bot.isConnected()) bot.sendIRC().quitServer(reason);
     }
 
     private void connected (Bot bot) {