diff --git a/src/extensions/core/slotDefaults.ts b/src/extensions/core/slotDefaults.ts
index ac5071699..eba9d3a51 100644
--- a/src/extensions/core/slotDefaults.ts
+++ b/src/extensions/core/slotDefaults.ts
@@ -68,6 +68,7 @@ app.registerExtension({
         this.slot_types_default_in[type] = ['Reroute'] // ["Reroute", "Primitive"];  primitive doesn't always work :'()
       }
 
+      if (this.slot_types_default_in[type].includes(nodeId)) continue
       this.slot_types_default_in[type].push(nodeId)
 
       // Store each node that can handle this output type