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-rw-r--r--libs/ardour/session_transport.cc4
1 files changed, 4 insertions, 0 deletions
diff --git a/libs/ardour/session_transport.cc b/libs/ardour/session_transport.cc
index 1b17362946..b69565f384 100644
--- a/libs/ardour/session_transport.cc
+++ b/libs/ardour/session_transport.cc
@@ -1740,6 +1740,10 @@ Session::use_sync_source (Slave* new_slave)
{
/* Runs in process() context */
+ if (!_slave && !new_slave) {
+ return;
+ }
+
bool non_rt_required = false;
/* XXX this deletion is problematic because we're in RT context */