diff --git a/prometheus/src/main/java/org/opensearch/sql/prometheus/client/PrometheusClientImpl.java b/prometheus/src/main/java/org/opensearch/sql/prometheus/client/PrometheusClientImpl.java
index 4a469c7bbb..512c014564 100644
--- a/prometheus/src/main/java/org/opensearch/sql/prometheus/client/PrometheusClientImpl.java
+++ b/prometheus/src/main/java/org/opensearch/sql/prometheus/client/PrometheusClientImpl.java
@@ -106,7 +106,8 @@ private JSONObject readResponse(Response response) throws IOException {
       }
     } else {
       throw new RuntimeException(
-          String.format("Request to Prometheus is Unsuccessful with : %s", response.message()));
+          String.format("Request to Prometheus is Unsuccessful with : %s", Objects.requireNonNull(
+              response.body(), "Response body can't be null").string()));
     }
   }