MyNotes fails to launch in Linux Mint 17.3 with LXDE desktop

MyNotes works in Linux Mint 18.1 but fails to launch in in Linux Mint 17.3 with LXDE desktop
```
$ mynotes
Gdk-CRITICAL **: gdk_window_thaw_toplevel_updates: assertion 'window->update_and_descendants_freeze_count > 0' failed
```