diff --git a/proxy/pkg/zdmproxy/clienthandler.go b/proxy/pkg/zdmproxy/clienthandler.go
index 498e767..066acf0 100644
--- a/proxy/pkg/zdmproxy/clienthandler.go
+++ b/proxy/pkg/zdmproxy/clienthandler.go
@@ -1543,8 +1543,9 @@ func (ch *ClientHandler) handleRequestSendFailure(err error, frameContext *frame
 			frameContext.frame.Header.StreamId, frameContext.frame.Header.Version, responseMessage)
 		if err != nil {
 			log.Errorf("could not generate protocol error response raw frame (%v): %v", responseMessage, err)
+		} else {
+			ch.clientConnector.sendResponseToClient(responseFrame)
 		}
-		ch.clientConnector.sendResponseToClient(responseFrame)
 	}
 }