diff --git a/common/src/main/java/org/samo_lego/simpleauth/mixin/MixinSlot.java b/common/src/main/java/org/samo_lego/simpleauth/mixin/MixinSlot.java
index b781d5b..3ca726e 100644
--- a/common/src/main/java/org/samo_lego/simpleauth/mixin/MixinSlot.java
+++ b/common/src/main/java/org/samo_lego/simpleauth/mixin/MixinSlot.java
@@ -16,19 +16,20 @@ public abstract class MixinSlot {
     // Denying item moving etc.
     @Inject(method = "canTakeItems(Lnet/minecraft/entity/player/PlayerEntity;)Z", at = @At(value = "HEAD"), cancellable = true)
     private void canTakeItems(PlayerEntity playerEntity, CallbackInfoReturnable<Boolean> cir) {
-        ServerPlayerEntity player = (ServerPlayerEntity) playerEntity;
-        ActionResult result = AuthEventHandler.onTakeItem(player);
+        if (playerEntity instanceof ServerPlayerEntity player) {
+            ActionResult result = AuthEventHandler.onTakeItem(player);
 
-        if (result == ActionResult.FAIL) {
-            // Canceling the item taking
-            player.networkHandler.sendPacket(
-                    new ScreenHandlerSlotUpdateS2CPacket(
-                            -2,
-                            0,
-                            player.getInventory().selectedSlot,
-                            player.getInventory().getStack(player.getInventory().selectedSlot))
-            );
-            cir.setReturnValue(false);
+            if (result == ActionResult.FAIL) {
+                // Canceling the item taking
+                player.networkHandler.sendPacket(
+                        new ScreenHandlerSlotUpdateS2CPacket(
+                                -2,
+                                0,
+                                player.getInventory().selectedSlot,
+                                player.getInventory().getStack(player.getInventory().selectedSlot))
+                );
+                cir.setReturnValue(false);
+            }
         }
     }
 }