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-rw-r--r--libs/ardour/session_process.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/session_process.cc b/libs/ardour/session_process.cc
index 7788eb2b97..fabf4d7d01 100644
--- a/libs/ardour/session_process.cc
+++ b/libs/ardour/session_process.cc
@@ -1033,6 +1033,7 @@ Session::queue_event (SessionEvent* ev)
} else if (_state_of_the_state & Loading) {
merge_event (ev);
} else {
+ Glib::Threads::Mutex::Lock lm (rb_write_lock);
pending_events.write (&ev, 1);
}
}