diff --git a/src/client/src/tscSql.c b/src/client/src/tscSql.c
index 849fe0ba73c20c16db40a593a38648566ca1265d..a025829343e6efeaedcb692eb9452743ea4cbf1c 100644
--- a/src/client/src/tscSql.c
+++ b/src/client/src/tscSql.c
@@ -211,7 +211,9 @@ TAOS *taos_connect_internal(const char *ip, const char *user, const char *pass,
       } else {
         printf("taos connect failed, reason: %s.\n\n", tstrerror(terrno));
       }
+      int32_t lastError = terrno;
       taos_free_result(pSql);
+      if (terrno != lastError) terrno = lastError;
       taos_close(pObj);
       return NULL;
     }