diff --git a/src/lib/litegraph/src/subgraph/SubgraphNode.ts b/src/lib/litegraph/src/subgraph/SubgraphNode.ts
index 846d40a67..6644fcf51 100644
--- a/src/lib/litegraph/src/subgraph/SubgraphNode.ts
+++ b/src/lib/litegraph/src/subgraph/SubgraphNode.ts
@@ -72,6 +72,7 @@ export class SubgraphNode extends LGraphNode implements BaseLGraph {
       (e) => {
         const subgraphInput = e.detail.input
         const { name, type } = subgraphInput
+        if (this.inputs.some((i) => i.name == name)) return
         const input = this.addInput(name, type)
 
         this.#addSubgraphInputListeners(subgraphInput, input)