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-rw-r--r--libs/ardour/audioengine.cc4
1 files changed, 3 insertions, 1 deletions
diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 67f1f15c4d..6176ebd4df 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -205,7 +205,9 @@ AudioEngine::process_callback (pframes_t nframes)
if (!tm.locked()) {
/* return having done nothing */
- Xrun();
+ if (_session) {
+ Xrun();
+ }
_processed_frames = next_processed_frames;
return 0;
}