Update src/addons/addons/cat-blocks/userscript.js

src/addons/addons/cat-blocks/userscript.js

@@ -276,6 +276,7 @@ export default async function ({ addon, console }) {
       this.sa_catBlockConstructor();
     }
     const r = originalRenderDraw.call(this, ...args);
+    if (this.output_ !== undefined) return r;
     if (!this.outputConnection && !this.previousConnection) {
       this.initCatStuff();
     }
@@ -341,4 +342,4 @@ export default async function ({ addon, console }) {
       workspace.toolboxRefreshEnabled_ = true;
     }
   }
-}
+}