diff --git a/patches/server/Add-slot-sanity-checks-in-container-clicks.patch b/patches/server/Add-slot-sanity-checks-in-container-clicks.patch
index 41a447084..960ee217a 100644
--- a/patches/server/Add-slot-sanity-checks-in-container-clicks.patch
+++ b/patches/server/Add-slot-sanity-checks-in-container-clicks.patch
@@ -20,7 +20,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                  int j2;
  
                  if (actionType == ClickType.SWAP) {
-+                    if (slotIndex < 0) return; // Paper
++                    if (slotIndex < 0 || button < 0) return; // Paper
                      slot2 = (Slot) this.slots.get(slotIndex);
                      itemstack1 = playerinventory.getItem(button);
                      itemstack = slot2.getItem();