diff --git a/src/components/Playground.jsx b/src/components/Playground.jsx
index 44929c21..30ae37b7 100644
--- a/src/components/Playground.jsx
+++ b/src/components/Playground.jsx
@@ -257,7 +257,7 @@ export default function Playground() {
   const [callFlag, setCallFlag] = useState(false)
   // const { data: tutoData, error, isLoadin g } = useSWR('http://localhost:8080/api/tutorial', getFetcher)
   const { data: tutoData, error, isLoading } = useSWR(callFlag ? 'http://localhost:8080/api/tutorial' : null, getFetcher)
-  const { trigger, isMutating: postIsMutating } = useSWRMutation('http://localhost:8080/api/tutorial', postFetcher)
+  const { trigger, isMutating } = useSWRMutation('http://localhost:8080/api/tutorial', postFetcher)
 
   if (isLoading) {
     return <div>Loading...</div>