https://bugreports.qt.io/browse/QTBUG-135959
https://github.com/qt/qtwebsockets/commit/0c0f476150e501f311d054c67426b4d2304d2cbd
--- a/src/websockets/qwebsocket_p.cpp
+++ b/src/websockets/qwebsocket_p.cpp
@@ -719,4 +719,8 @@
 {
-    if (Q_LIKELY(pTcpSocket))
+    if (Q_LIKELY(pTcpSocket)) {
+        // Explicitly disconnect this signal to avoid warning being printed about a destroyed-signal
+        // being disconnected with the wildcard disconnect below
+        disconnect(pTcpSocket, &QObject::destroyed, this, &QWebSocketPrivate::socketDestroyed);
         pTcpSocket->disconnect();
+    }
     m_dataProcessor->disconnect();