commenting out:
     /*transition: 100ms ease-in-out;*/

appears to fix (or workaround the issue).
The relevant part:

GtkComboBox,
.button {
    background-image: -gtk-gradient (linear, left top, left bottom,
                                     from (shade (@button_bg_color, 1.1)),
                                     to (shade (@button_bg_color, 0.9)));
    border-radius: 3px;
    border-style: solid;

    color: @fg_color;
    text-shadow: 0 1 alpha (shade (@button_bg_color, 1.25), 0.4);

    /*transition: 100ms ease-in-out;*/

    -unico-border-gradient: -gtk-gradient (linear, left top, left bottom,
                                           from (shade (@button_bg_color, 
0.85)),
                                           to (shade (@button_bg_color, 0.67)));
    -unico-glow-color: shade (@button_bg_color, 1.14);
    -unico-glow-radius: 6;
    -unico-inner-stroke-gradient: -gtk-gradient (linear, left top, left bottom,
                                                 from (shade (@button_bg_color, 
1.16)),
                                                 to (shade (@button_bg_color, 
1.015)));
    -unico-inner-stroke-width: 1px;
}

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https://bugs.launchpad.net/bugs/1002792

Title:
  emesene crashes with assertion failed in gtkstylecontext.c

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