> even though I try to close all readers right away Define what is "close all readers" in your mind. There is no way to "close" a "reader". You may "close" a "connection" and you may "finalize" a "statement". Which one of these options equates with "close a reader" in your mind? You will note that the error is telling you that you forgot to "finalize a statement" or to commit/rollback a transaction. These states can exist notwithstanding that you "closed the connection" embodying the abberent behaviour.