From fe15fc8a84f93c889cbcca5a1904e98f963e0a72 Mon Sep 17 00:00:00 2001
From: Haojun Liao <hjliao@taosdata.com>
Date: Tue, 29 Dec 2020 18:48:52 +0800
Subject: [PATCH] [TD-2609]<fix>: fix the crash in case of only one negative
 value to apply apercentile query.

---
 src/query/src/qHistogram.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/query/src/qHistogram.c b/src/query/src/qHistogram.c
index 6ae6ede972..0d31948e59 100644
--- a/src/query/src/qHistogram.c
+++ b/src/query/src/qHistogram.c
@@ -174,7 +174,7 @@ int32_t tHistogramAdd(SHistogramInfo** pHisto, double val) {
       }
 
       assert((*pHisto)->elems[idx].val > val);
-    } else {
+    } else if ((*pHisto)->numOfElems > 0) {
       assert((*pHisto)->elems[(*pHisto)->numOfEntries].val < val);
     }
 
-- 
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