diff --git a/com.twin.app.shoptime/src/views/OnSalePanel/OnSalePanel.jsx b/com.twin.app.shoptime/src/views/OnSalePanel/OnSalePanel.jsx
index 6d27bef2..b440330a 100644
--- a/com.twin.app.shoptime/src/views/OnSalePanel/OnSalePanel.jsx
+++ b/com.twin.app.shoptime/src/views/OnSalePanel/OnSalePanel.jsx
@@ -108,8 +108,9 @@ export default function OnSalePanel({ panelInfo, spotlightId }) {
       if (categoryInfos) {
         dispatch(copyCategoryInfos(categoryInfos));
         setCategories(categoryInfos);
-        setSelectedLgCatCd(panelInfo?.lgCatCd);
-        setSelectedLgCatNm(panelInfo?.lgCatNm);
+        // GNB 진입 시 panelInfo가 비어있으면 첫 번째 카테고리를 기본값으로 설정
+        setSelectedLgCatCd(panelInfo?.lgCatCd ?? categoryInfos[0]?.lgCatCd);
+        setSelectedLgCatNm(panelInfo?.lgCatNm ?? categoryInfos[0]?.lgCatNm);
       }
     }
   }, [