fix thinko when relabelling markers

diff --git a/gtk2_ardour/editor_markers.cc b/gtk2_ardour/editor_markers.cc
index 1302804cec2d31bce22e2203ec61b5318abcb8de..3fefa6af9ac35f080a86970e719b9166d0467a23 100644 (file)
--- a/gtk2_ardour/editor_markers.cc
+++ b/gtk2_ardour/editor_markers.cc
@@ -334,7 +334,10 @@ Editor::update_marker_labels (ArdourCanvas::Group* group)
 
        list<Marker*>::iterator prev = sorted.end ();
        list<Marker*>::iterator next = i;
-       ++next;
+
+       if (next != sorted.end()) {
+               ++next;
+       }
 
        while (i != sorted.end()) {