diff --git a/api/src/main/java/com/velocitypowered/api/proxy/Player.java b/api/src/main/java/com/velocitypowered/api/proxy/Player.java
index 057b8a2398..c4b8703f73 100644
--- a/api/src/main/java/com/velocitypowered/api/proxy/Player.java
+++ b/api/src/main/java/com/velocitypowered/api/proxy/Player.java
@@ -197,7 +197,7 @@ default void clearHeaderAndFooter() {
    *
    * @param reason component with the reason
    */
-  void disconnect(Component reason);
+  void disconnect(@NotNull Component reason);
 
   /**
    * Sends chat input onto the players current server as if they typed it into the client chat box.
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 47d59a7186..8d39fcf9f6 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
@@ -111,6 +111,7 @@
 import java.util.HashSet;
 import java.util.List;
 import java.util.Locale;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
@@ -645,7 +646,8 @@ public InternalTabList getTabList() {
   }
 
   @Override
-  public void disconnect(Component reason) {
+  public void disconnect(@NotNull Component reason) {
+    Objects.requireNonNull(reason, "reason");
     if (connection.eventLoop().inEventLoop()) {
       disconnect0(reason, false);
     } else {