diff --git a/server/TracyWorker.cpp b/server/TracyWorker.cpp
index 6ad51490..5965f181 100644
--- a/server/TracyWorker.cpp
+++ b/server/TracyWorker.cpp
@@ -2781,7 +2781,7 @@ void Worker::CheckThreadString( uint64_t id )
     m_data.threadNames.emplace( id, "???" );
     m_pendingThreads++;
 
-    Query( ServerQueryThreadString, id );
+    if( m_sock.IsValid() ) Query( ServerQueryThreadString, id );
 }
 
 void Worker::CheckExternalName( uint64_t id )