From ca24b7878cf7cf097a78780c0ec8d2e037089e6e Mon Sep 17 00:00:00 2001
From: Kevin Matz <kevin@company235.com>
Date: Sun, 9 Apr 2023 20:09:03 -0400
Subject: [PATCH] only write the message data if there is any

---
 platform/qt/dmxwidget/dmxwidget.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/platform/qt/dmxwidget/dmxwidget.cpp b/platform/qt/dmxwidget/dmxwidget.cpp
index 7acdf3c..751bef7 100644
--- a/platform/qt/dmxwidget/dmxwidget.cpp
+++ b/platform/qt/dmxwidget/dmxwidget.cpp
@@ -126,7 +126,8 @@ void DmxWidget::sendMessage(std::shared_ptr<ENTTEC::Pro::MessageData> msg) const
   *stream << ENTTEC::Pro::START_DELIMITER;
   *stream << msg->label;
   *stream << length;
-  *stream << msg;
+  if (length)
+    *stream << msg;
   *stream << ENTTEC::Pro::END_DELIMITER;
 
   port_->write(reinterpret_cast<char*>(buffer), sizeof(buffer));