diff --git a/devfront/src/features/clients/ClientGeneralPage.tsx b/devfront/src/features/clients/ClientGeneralPage.tsx
index 9e50b2c8..4db69296 100644
--- a/devfront/src/features/clients/ClientGeneralPage.tsx
+++ b/devfront/src/features/clients/ClientGeneralPage.tsx
@@ -157,6 +157,17 @@ function ClientGeneralPage() {
       }
       alert(t("msg.dev.clients.general.saved", "설정이 저장되었습니다."));
     },
+    onError: (err) => {
+      const errorMessage =
+        (err as AxiosError<{ error?: string }>).response?.data?.error ??
+        (err as Error)?.message ??
+        t("msg.common.unknown_error", "unknown error");
+      alert(
+        t("msg.dev.clients.general.save_error", "저장에 실패했습니다: {{error}}", {
+          error: errorMessage,
+        }),
+      );
+    },
   });
 
   if (!isCreate && isLoading) {