diff --git a/src/nkpgsql.erl b/src/nkpgsql.erl
index 04350b6..4cc1f84 100644
--- a/src/nkpgsql.erl
+++ b/src/nkpgsql.erl
@@ -153,6 +153,9 @@ do_query(Pid, Query, QueryMeta) when is_pid(Pid) ->
         {error, {pgsql_error, #{code := <<"XX000">>}}=Error} ->
             ?LLOG(notice, "no_transaction PGSQL error: ~p\n~s", [Error, list_to_binary([Query])]),
             throw(no_transaction);
+        {error, {pgsql_error, #{code := <<"XXUUU">>}}=Error} ->
+            ?LLOG(notice, "no_transaction PGSQL error: ~p\n~s", [Error, list_to_binary([Query])]),
+            throw(no_transaction);
         {error, {pgsql_error, #{code := <<"42P01">>}}} ->
             throw(relation_unknown);
         {error, {pgsql_error, #{code := <<"42601">>}}=Error} ->