Binding icon font to tab button crashes application

import dearpygui.dearpygui as dpg

dpg.create_context()


def add_font(file, size: int | float, parent=0, **kwargs) -> int:
    if not isinstance(size, (int, float)):
        raise ValueError(f'font size must be an integer or float. Not {type(size)}')

    chars = ['', '', '', '', '', '', '', '', '', '', '', '', '', '', '']
    for i, char in enumerate(chars):
        chars[i] = ord(char)

    with dpg.font(file, size, parent=parent, **kwargs) as font:
        dpg.add_font_range_hint(dpg.mvFontRangeHint_Default, parent=font)
        dpg.add_font_range_hint(dpg.mvFontRangeHint_Cyrillic, parent=font)
        dpg.add_font_chars(chars, parent=font)
    return font


with dpg.font_registry():
    box_icons = add_font("boxicons.ttf", 30, tag="_box_icons")

dpg.create_viewport(title='Private Use Area Unicode Block Test', width=720, height=520, resizable=False)

with dpg.window(label="Font Test", tag="_font_test"):
    with dpg.tab_bar(tag="_font_test_bar") as tb:
        with dpg.tab(label="Compression", tag="_font_test_tab"):
            icons = dpg.add_text("              ")
            dpg.bind_item_font(icons, box_icons)
        dpg.add_tab_button(label="", leading=True, tag="_toggle")
        dpg.bind_item_font("_toggle", box_icons)

dpg.setup_dearpygui()
dpg.set_primary_window("_font_test", True)
dpg.show_viewport()

while dpg.is_dearpygui_running():
    dpg.render_dearpygui_frame()
dpg.destroy_context()