diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 7c2f8e8958f70eb76bae596001cbf6682a30a02e..eda338bf739010596842079641d419a0721311d3 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -2263,7 +2263,7 @@ int32_t addProjectionExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, t
       pToken = &left->columnName;
 
       tSqlExpr* right = pItem->pNode->pRight;
-      if(right != NULL || right->type != SQL_NODE_VALUE || right->tokenId != TK_STRING){
+      if(right == NULL || right->type != SQL_NODE_VALUE || right->tokenId != TK_STRING){
         return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg5);
       }
     }else {