diff --git a/packages/ava/src/advisor/advise-pipeline/advicesForChart.ts b/packages/ava/src/advisor/advise-pipeline/advicesForChart.ts
index b7547ba7..6007151e 100644
--- a/packages/ava/src/advisor/advise-pipeline/advicesForChart.ts
+++ b/packages/ava/src/advisor/advise-pipeline/advicesForChart.ts
@@ -92,6 +92,6 @@ export function advicesForChart(
     // if the input data cannot be transformed into DataFrame
     // eslint-disable-next-line no-console
     console.error('error: ', error);
-    return null;
+    return { advices: [], log: [] };
   }
 }