diff --git a/src/transport/stream-transport.hpp b/src/transport/stream-transport.hpp
index 99dc510..5ec91b0 100644
--- a/src/transport/stream-transport.hpp
+++ b/src/transport/stream-transport.hpp
@@ -195,6 +195,10 @@
         BOOST_THROW_EXCEPTION(Transport::Error(error, "error while sending data to socket"));
       }
 
+    if (!m_transport.m_isConnected) {
+      return; // queue has been already cleared
+    }
+
     m_transmissionQueue.erase(queueItem);
 
     if (!m_transmissionQueue.empty()) {