diff --git a/Content.Server/VendingMachines/VendingMachineSystem.cs b/Content.Server/VendingMachines/VendingMachineSystem.cs
index 9125bd8756..6d7ebef464 100644
--- a/Content.Server/VendingMachines/VendingMachineSystem.cs
+++ b/Content.Server/VendingMachines/VendingMachineSystem.cs
@@ -114,6 +114,9 @@ namespace Content.Server.VendingMachines
 
         private void OnBoundUIClosed(EntityUid uid, VendingMachineComponent component, BoundUIClosedEvent args)
         {
+            if (args.UiKey is not VendingMachineUiKey)
+                return;
+
             if ((VendingMachineUiKey) args.UiKey != VendingMachineUiKey.Key)
                 return;