diff --git a/src/base/bittorrent/sessionimpl.cpp b/src/base/bittorrent/sessionimpl.cpp
index 18644a370..b909e67a6 100644
--- a/src/base/bittorrent/sessionimpl.cpp
+++ b/src/base/bittorrent/sessionimpl.cpp
@@ -627,6 +627,8 @@ SessionImpl::~SessionImpl()
     // we delete lt::session
     delete Net::PortForwarder::instance();
 
+    // We must stop "async worker" only after deletion
+    // of all the components that could potentially use it
     m_asyncWorker->clear();
     m_asyncWorker->waitForDone();