src/main/java/me/creepermaxcz/mcbots/MainListener.java

@@ -21,25 +21,35 @@ public class MainListener implements SessionListener {
         // Instead, they use ClientboundPlayerChatPacket and ClientboundSystemChatPacket for taking care of chat packets.
         Component message = null;
         Component sender = null;
+        boolean isMessageNull = false; // For some cases when message is null.
 
         if (packet instanceof ClientboundPlayerChatPacket) {
             ClientboundPlayerChatPacket clientboundPlayerChatPacket = ((ClientboundPlayerChatPacket) packet);
             message = clientboundPlayerChatPacket.getUnsignedContent();
             sender = clientboundPlayerChatPacket.getName();
+            isMessageNull = message == null;
         } else if (packet instanceof ClientboundSystemChatPacket) {
             message = ((ClientboundSystemChatPacket) packet).getContent();
         }
 
-        if (message instanceof TextComponent) {
+        // For some commands (like /say), ClientboundPlayerChatPacket.getUnsignedContent() is null.
+        // However for those cases, the message is still valid in ClientboundPlayerChatPacket.getMessagePlain()
+        // Thus, this if condition will figure out if this case was the case and prints out message from the packet.
+        if (isMessageNull) { // When this message was null.
+            ClientboundPlayerChatPacket clientboundPlayerChatPacket = ((ClientboundPlayerChatPacket) packet);
+            Log.chat(Utils.getFullText((TextComponent) sender, clientboundPlayerChatPacket.getMessagePlain(), Main.coloredChat));
+        } else {  // If this was normal case when unsigned content was not null.
+            if (message instanceof TextComponent) { // For normal chat packets.
                 // Log.chat(Utils.getFullText((TextComponent) message, Main.coloredChat)); // Use this for only messages.
                 Log.chat(Utils.getFullText((TextComponent) sender, (TextComponent) message, Main.coloredChat)); // Use this for messages and sender's username.
             }
 
-        if (message instanceof TranslatableComponent) {
+            if (message instanceof TranslatableComponent) { // For system chat packets (such as user joining server).
                 TranslatableComponent msg = (TranslatableComponent) message;
                 Log.chat("[T]", Utils.translate(msg));
             }
         }
+    }
 
     @Override
     public void packetSending(PacketSendingEvent event) {

src/main/java/me/creepermaxcz/mcbots/Utils.java

@@ -88,6 +88,37 @@ public class Utils {
         }
     }
 
+    /**
+     * A static function that gets full text from text components.
+     * From 1.19.1 the protocol does not include sender's information in the message.
+     * Sometimes the message as component is null. When this happens, this method will show message as String.
+     * Since this is just a String being represented, this will not have formatting on String.
+     * @param sender The TextComponent for sender.
+     * @param message The TextComponent for message.
+     * @param colored Whether if this output was colored or not.
+     * @return Returns String in "Username : Message" format.
+     */
+    public static String getFullText(TextComponent sender, String message, boolean colored) {
+        if (colored) { // Check if we are using colors.
+            Style senderStyle = sender.style();
+
+            StringBuilder outString = new StringBuilder();
+
+            if (senderStyle.color() != null) { // Generate sender text with color.
+                NamedTextColor color = (NamedTextColor) senderStyle.color();
+                outString.append(colorize(sender.content(), getColor(color)));
+            } else {
+                outString.append(sender.content());
+            }
+
+            outString.append(" : "); // Add delimiter as : between sender and message.
+            outString.append(message);
+            return outString.toString();
+        } else { // When color formating was disabled.
+            return sender.content() + " : " + message;
+        }
+    }
+
     public static Attribute getColor(NamedTextColor color) {
         switch (color.toString()) {
             case "red":