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-rw-r--r--libs/pbd/system_exec.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/pbd/system_exec.cc b/libs/pbd/system_exec.cc
index 60e73badfc..721db98a7e 100644
--- a/libs/pbd/system_exec.cc
+++ b/libs/pbd/system_exec.cc
@@ -671,6 +671,7 @@ SystemExec::terminate ()
wait();
if (thread_active) pthread_join(thread_id_tt, NULL);
thread_active = false;
+ assert(pid == 0);
::pthread_mutex_unlock(&write_lock);
}