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-rw-r--r--src/wx/film_viewer.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/wx/film_viewer.cc b/src/wx/film_viewer.cc
index 8c1ce34e0..526233833 100644
--- a/src/wx/film_viewer.cc
+++ b/src/wx/film_viewer.cc
@@ -262,6 +262,8 @@ FilmViewer::slider_changed (wxCommandEvent &)
void
FilmViewer::film_changed (FilmState::Property p)
{
+ ensure_ui_thread ();
+
switch (p) {
case FilmState::THUMBS:
if (_film && _film->thumbs().size() > 1) {