diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index b443f1f5b147c6fadd73774b97d5068568b466a2..49248d335ee19501fb719ac8958f4c5cc2d251a6 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -5697,26 +5697,16 @@ int8_t jsonType2DbType(double data, int jsonType){
 }
 
 void* getJsonTagValue(STable* pTable, char* key, int32_t keyLen, int16_t* retColId){
-  if(TABLE_TYPE(pTable) == TSDB_CHILD_TABLE){
-    STable* superTable= pTable->pSuper;
-    SArray** data = (SArray**)taosHashGet(superTable->jsonKeyMap, key, keyLen);
-    if(data == NULL) return NULL;
-    JsonMapValue jmvalue = {pTable, 0};
-    JsonMapValue* p = taosArraySearch(*data, &jmvalue, tsdbCompareJsonMapValue, TD_EQ);
-    if (p == NULL) return NULL;
-    int16_t colId = p->colId + 1;
-    if(retColId) *retColId = p->colId;
-    return tdGetKVRowValOfCol(pTable->tagVal, colId);
-  }else if(TABLE_TYPE(pTable) == TSDB_SUPER_TABLE){
-    SArray** data = (SArray**)taosHashGet(pTable->jsonKeyMap, key, keyLen);
-    if(data == NULL) return NULL;
-    if(taosArrayGetSize(*data) == 0) return NULL;
-    JsonMapValue* p = taosArrayGet(*data, 0);
-    int16_t colId = p->colId + 1;
-    if(retColId) *retColId = p->colId;
-    return tdGetKVRowValOfCol(((STable*)(p->table))->tagVal, colId);
-  }
-  return NULL;
+  assert(TABLE_TYPE(pTable) == TSDB_CHILD_TABLE);
+  STable* superTable= pTable->pSuper;
+  SArray** data = (SArray**)taosHashGet(superTable->jsonKeyMap, key, keyLen);
+  if(data == NULL) return NULL;
+  JsonMapValue jmvalue = {pTable, 0};
+  JsonMapValue* p = taosArraySearch(*data, &jmvalue, tsdbCompareJsonMapValue, TD_EQ);
+  if (p == NULL) return NULL;
+  int16_t colId = p->colId + 1;
+  if(retColId) *retColId = p->colId;
+  return tdGetKVRowValOfCol(pTable->tagVal, colId);
 }
 
 // get key from json->'key'
diff --git a/src/query/src/qFilter.c b/src/query/src/qFilter.c
index b92953a5068bbee302be3e0c405c11367a655418..d0eb45a150a8f5a9b02b175284929e7882205245 100644
--- a/src/query/src/qFilter.c
+++ b/src/query/src/qFilter.c
@@ -2951,7 +2951,7 @@ static FORCE_INLINE bool filterExecuteImplIsNull(void *pinfo, int32_t numOfRows,
     uint32_t uidx = info->groups[0].unitIdxs[0];
     void *colData = (char *)info->cunits[uidx].colData + info->cunits[uidx].dataSize * i;
     if(info->cunits[uidx].dataType == TSDB_DATA_TYPE_JSON){
-      colData += CHAR_BYTES;
+      if(colData) colData += CHAR_BYTES;
     }
     (*p)[i] = ((colData == NULL) || isNull(colData, info->cunits[uidx].dataType));
     if ((*p)[i] == 0) {
@@ -2977,7 +2977,7 @@ static FORCE_INLINE bool filterExecuteImplNotNull(void *pinfo, int32_t numOfRows
     uint32_t uidx = info->groups[0].unitIdxs[0];
     void *colData = (char *)info->cunits[uidx].colData + info->cunits[uidx].dataSize * i;
     if(info->cunits[uidx].dataType == TSDB_DATA_TYPE_JSON){
-      colData += CHAR_BYTES;
+      if(colData) colData += CHAR_BYTES;
     }
     (*p)[i] = ((colData != NULL) && !isNull(colData, info->cunits[uidx].dataType));
     if ((*p)[i] == 0) {