diff --git a/source/client/src/clientSmlJson.c b/source/client/src/clientSmlJson.c
index bff4f49735345e56d1db29e2a478814a956f8546..31b0ed455b0c8c4cb9c385d5daf4762052e77741 100644
--- a/source/client/src/clientSmlJson.c
+++ b/source/client/src/clientSmlJson.c
@@ -342,8 +342,8 @@ int smlJsonParseObjFirst(char **start, SSmlLineInfo *element, int8_t *offset){
     (*start)++;
   }
 
-  if(unlikely(index != OTD_JSON_FIELDS_NUM)) {
-    uError("elements != %d", OTD_JSON_FIELDS_NUM)
+  if(unlikely(index != OTD_JSON_FIELDS_NUM) || element->tags == NULL || element->cols == NULL || element->measure == NULL || element->timestamp == NULL) {
+    uError("elements != %d or element parse null", OTD_JSON_FIELDS_NUM)
     return -1;
   }
   return 0;