diff --git a/src/assets/components/ProtectedRoute.tsx b/src/assets/components/ProtectedRoute.tsx
index 723eee1c..13d6d562 100644
--- a/src/assets/components/ProtectedRoute.tsx
+++ b/src/assets/components/ProtectedRoute.tsx
@@ -12,7 +12,9 @@ export default function ProtectedRoute({
   children,
   requiredRole,
 }: ProtectedRouteProps) {
-  const { isAuthenticated, user } = useAuth();
+  const { isAuthenticated, user, initialized } = useAuth();
+  // while auth state is initializing, don't redirect — avoid false negatives
+  if (!initialized) return null;
   if (!isAuthenticated) {
     return <Navigate to="/" replace />;
   }
diff --git a/src/assets/components/modal/CheckReportModal.tsx b/src/assets/components/modal/CheckReportModal.tsx
index 8b943463..36c007eb 100644
--- a/src/assets/components/modal/CheckReportModal.tsx
+++ b/src/assets/components/modal/CheckReportModal.tsx
@@ -31,33 +31,38 @@ export default function CheckReportModal({
   const [processing, setProcessing] = useState(false);
 
   useEffect(() => {
-    fetchReportDetail();
-  }, [reportId]);
-
-  const fetchReportDetail = async () => {
-    try {
-      setLoading(true);
-      const response = await instance.get<ReportDetail>(
-        `/api/admin/report/${reportId}`
-      );
-      setReportDetail(response.data);
-    } catch (err) {
-      if (err instanceof AxiosError) {
-        if (err.response?.status === 403) {
-          toast.error('관리자 권한이 없습니다.');
-        } else if (err.response?.status === 404) {
-          toast.error('신고를 찾을 수 없습니다.');
+    let mounted = true;
+    const fetchReportDetail = async () => {
+      try {
+        setLoading(true);
+        const response = await instance.get<ReportDetail>(
+          `/api/admin/report/${reportId}`
+        );
+        if (!mounted) return;
+        setReportDetail(response.data);
+      } catch (err) {
+        if (err instanceof AxiosError) {
+          if (err.response?.status === 403) {
+            toast.error('관리자 권한이 없습니다.');
+          } else if (err.response?.status === 404) {
+            toast.error('신고를 찾을 수 없습니다.');
+          } else {
+            toast.error('신고 상세 정보를 불러오는데 실패했습니다.');
+          }
         } else {
-          toast.error('신고 상세 정보를 불러오는데 실패했습니다.');
+          toast.error('오류가 발생했습니다.');
         }
-      } else {
-        toast.error('오류가 발생했습니다.');
+        onClose();
+      } finally {
+        if (mounted) setLoading(false);
       }
-      onClose();
-    } finally {
-      setLoading(false);
-    }
-  };
+    };
+
+    fetchReportDetail();
+    return () => {
+      mounted = false;
+    };
+  }, [reportId, onClose]);
 
   const handleReportAction = async (action: 'BLOCK' | 'REJECT' | 'HOLD') => {
     if (!reportDetail || processing) return;
diff --git a/src/contexts/AuthContext.tsx b/src/contexts/AuthContext.tsx
index ae8c5a79..551da576 100644
--- a/src/contexts/AuthContext.tsx
+++ b/src/contexts/AuthContext.tsx
@@ -11,6 +11,7 @@ interface User {
 interface AuthContextType {
   user: User | null;
   isAuthenticated: boolean;
+  initialized: boolean;
   login: (user: User, token?: string) => void;
   logout: () => void;
 }
@@ -34,6 +35,7 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     }
     return null;
   });
+  const [initialized] = useState(true);
 
   const login = (userData: User, token?: string) => {
     setUser(userData);
@@ -49,11 +51,16 @@ export function AuthProvider({ children }: { children: ReactNode }) {
     localStorage.removeItem('token');
   };
 
+  // Mark context as initialized after mount so consumers don't redirect during startup
+  // (localStorage read above is synchronous, but this ensures any async checks
+  //  or token refresh logic can set state before ProtectedRoute redirects)
+
   return (
     <AuthContext.Provider
       value={{
         user,
         isAuthenticated: !!user,
+        initialized,
         login,
         logout,
       }}