fix crash when opening audio/MIDI setup while playing etc.

diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index d20cbd3da92cba440fa24e961747e7bc697a15bc..aff1e22508881cba204d59ba2115a093706675ce 100644 (file)
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -1619,7 +1619,9 @@ EngineControl::EngineControl ()
                 enable_latency_tab ();
 
         } else {
-                ARDOUR::AudioEngine::instance()->stop_latency_detection();
+                if (lm_running) {
+                        ARDOUR::AudioEngine::instance()->stop_latency_detection();
+                }
         }
  }