diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index b0ad6d4a3c..7e31118a90 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -4314,6 +4314,10 @@ static bool isValidExpr(tSqlExpr* pLeft, tSqlExpr* pRight, int32_t optr) {
     return false;
   }
 
+  if (pLeft->tokenId >= TK_BOOL && pLeft->tokenId <= TK_BINARY && (optr == TK_NOTNULL || optr == TK_ISNULL)) {
+    return false;
+  }
+
   return true;
 }
 
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 107f630f3d..a1415c3ef8 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1054,7 +1054,7 @@ int tscBuildQueryMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
 
     SCond *pCond = tsGetSTableQueryCond(pTagCond, pTableMeta->id.uid);
     if (pCond != NULL && pCond->cond != NULL) {
-      pQueryMsg->tagCondLen = htonl(pCond->len);
+      pQueryMsg->tagCondLen = htons(pCond->len);
       memcpy(pMsg, pCond->cond, pCond->len);
 
       pMsg += pCond->len;