From 845d77508b10fdef777412d39696bcd6a2b91475 Mon Sep 17 00:00:00 2001
From: Kassian Sun <kassiansun@outlook.com>
Date: Thu, 23 Mar 2023 09:00:07 +0800
Subject: [PATCH] return null if _source is empty

---
 plugin/api/insight/metric_util.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/plugin/api/insight/metric_util.go b/plugin/api/insight/metric_util.go
index 367c6b00..7bc6ac33 100644
--- a/plugin/api/insight/metric_util.go
+++ b/plugin/api/insight/metric_util.go
@@ -385,6 +385,7 @@ func extractSomeValue(v interface{}) interface{} {
 		for _, v := range vm {
 			return extractSomeValue(v)
 		}
+		return nil
 	}
 	return v
 }