Merge branch 'master' of https://github.com/prusa3d/Slic3r into scene_manipulators

lib/Slic3r/GUI/3DScene.pm

@@ -908,6 +908,9 @@ sub deselect_volumes {
 
 sub select_volume {
     my ($self, $volume_idx) = @_;
+
+    return if ($volume_idx >= scalar(@{$self->volumes}));
+
     $self->volumes->[$volume_idx]->set_selected(1)
         if $volume_idx != -1;
 }