gistfile1.txt

diff --git a/proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java b/proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java
index aada98cf..2e4abedf 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java
@@ -345,6 +345,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
 
   @Override
   public void sendMessage(@NonNull Identity identity, @NonNull Component message) {
+    Preconditions.checkState(this.getConnection().getState() == StateRegistry.PLAY, "Player connection must be in Play state");
     Component translated = translateMessage(message);
 
     connection.write(getChatBuilderFactory().builder()
@@ -356,6 +357,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
       @NonNull MessageType type) {
     Preconditions.checkNotNull(message, "message");
     Preconditions.checkNotNull(type, "type");
+    Preconditions.checkState(this.getConnection().getState() == StateRegistry.PLAY, "Player connection must be in Play state");
 
     Component translated = translateMessage(message);
 
@@ -367,6 +369,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
 
   @Override
   public void sendActionBar(net.kyori.adventure.text.@NonNull Component message) {
+    Preconditions.checkState(this.getConnection().getState() == StateRegistry.PLAY, "Player connection must be in Play state");
     Component translated = translateMessage(message);
 
     ProtocolVersion playerVersion = getProtocolVersion();
@@ -412,6 +415,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
 
   @Override
   public void sendPlayerListHeaderAndFooter(final Component header, final Component footer) {
+    Preconditions.checkState(this.getConnection().getState() == StateRegistry.PLAY, "Player connection must be in Play state");
     Component translatedHeader = translateMessage(header);
     Component translatedFooter = translateMessage(footer);
     this.playerListHeader = translatedHeader;
@@ -423,6 +427,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
 
   @Override
   public void showTitle(net.kyori.adventure.title.@NonNull Title title) {
+    Preconditions.checkState(this.getConnection().getState() == StateRegistry.PLAY, "Player connection must be in Play state");
     if (this.getProtocolVersion().compareTo(ProtocolVersion.MINECRAFT_1_8) >= 0) {
       GsonComponentSerializer serializer = ProtocolUtils.getJsonChatSerializer(this
           .getProtocolVersion());