diff --git a/source/common/src/tdataformat.c b/source/common/src/tdataformat.c
index 34808aa389..d6ab974c6c 100644
--- a/source/common/src/tdataformat.c
+++ b/source/common/src/tdataformat.c
@@ -2453,6 +2453,11 @@ int32_t tColDataAddValueByDataBlock(SColData *pColData, int8_t type, int32_t byt
         code = tColDataAppendValueImpl[pColData->flag][CV_FLAG_NULL](pColData, NULL, 0);
         if (code) goto _exit;
       } else {
+        if(ASSERT(varDataTLen(data + offset) <= bytes)){
+          uError("var data length invalid, varDataTLen(data + offset):%d <= bytes:%d", (int)varDataTLen(data + offset), bytes);
+          code = TSDB_CODE_INVALID_PARA;
+          goto _exit;
+        }
         code = tColDataAppendValueImpl[pColData->flag][CV_FLAG_VALUE](pColData, (uint8_t *)varDataVal(data + offset),
                                                                       varDataLen(data + offset));
       }
diff --git a/tests/system-test/0-others/taosdMonitor.py b/tests/system-test/0-others/taosdMonitor.py
index 944ff52d5b..195f1ba5bc 100644
--- a/tests/system-test/0-others/taosdMonitor.py
+++ b/tests/system-test/0-others/taosdMonitor.py
@@ -292,7 +292,7 @@ class TDTestCase:
     def run(self):  # sourcery skip: extract-duplicate-method, remove-redundant-fstring
         tdSql.prepare()
         # time.sleep(2)
-        vgroups = "30"
+        vgroups = "8"
         sql = "create database db3 vgroups " + vgroups
         tdSql.query(sql)
         sql = "create table db3.stb (ts timestamp, f int) tags (t int)"
diff --git a/tests/system-test/0-others/telemetry.py b/tests/system-test/0-others/telemetry.py
index bc5d276faa..c62e3c2487 100644
--- a/tests/system-test/0-others/telemetry.py
+++ b/tests/system-test/0-others/telemetry.py
@@ -181,7 +181,7 @@ class TDTestCase:
     def run(self):  # sourcery skip: extract-duplicate-method, remove-redundant-fstring
         tdSql.prepare()
         # time.sleep(2)
-        vgroups = "30"
+        vgroups = "8"
         sql = "create database db3 vgroups " + vgroups
         tdSql.query(sql)