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-rw-r--r--src/wx/film_viewer.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/wx/film_viewer.cc b/src/wx/film_viewer.cc
index 78efc77f6..89702ac0c 100644
--- a/src/wx/film_viewer.cc
+++ b/src/wx/film_viewer.cc
@@ -129,6 +129,7 @@ FilmViewer::request_idle_get ()
}
_idle_get = true;
+ DCPOMATIC_ASSERT (signal_manager);
signal_manager->when_idle (boost::bind(&FilmViewer::idle_handler, this));
}