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-rw-r--r--gtk2_ardour/mixer_ui.cc1
1 files changed, 1 insertions, 0 deletions
diff --git a/gtk2_ardour/mixer_ui.cc b/gtk2_ardour/mixer_ui.cc
index 902c89387e..16f3089825 100644
--- a/gtk2_ardour/mixer_ui.cc
+++ b/gtk2_ardour/mixer_ui.cc
@@ -397,6 +397,7 @@ Mixer_UI::sync_order_keys (string const & src)
int old_key = order;
int new_key = route->order_key (N_("signal"));
+ assert (new_key < neworder.size());
neworder[new_key] = old_key;
if (new_key != old_key) {