diff --git a/src/AudioCapture.cpp b/src/AudioCapture.cpp
index 9cfa996..087d450 100644
--- a/src/AudioCapture.cpp
+++ b/src/AudioCapture.cpp
@@ -230,8 +230,11 @@ bool AudioCapture::startSource(bool monitoring, QString *error) {
     });
   });
 
-  connect(m_device, &QIODevice::readyRead, this, [this] {
-    const QByteArray chunk = m_device->readAll();
+  const QPointer<QIODevice> device = m_device;
+  connect(m_device, &QIODevice::readyRead, this, [this, device] {
+    if (!device || device != m_device)
+      return;
+    const QByteArray chunk = device->readAll();
     if (m_monitoring) {
       emit levelChanged(normalizedAudioPeak(chunk, m_format));
       return;