pyfpdf list index out of range for unicode emojies

fpdf can't ignore characters which can't print, simple example:

# font was taken here: https://fonts2u.com/symbola.font
from fpdf import FPDF


def txt_to_pdf(text, CV_file):
    pdf = FPDF()
    pdf.add_page()

    pdf.add_font('Symbola', '', 'fonts/Symbola_hint.ttf', uni=True)
    pdf.set_font('Symbola', style='', size=12)
    pdf.write(8, text)
    pdf.ln(8)

    pdf.output(CV_file, 'F')


text = '😉✌'
txt_to_pdf(text, 'test.pdf')

I've got the following error:

Traceback (most recent call last):
  File "test_pdf.py", line 25, in <module>
    txt_to_pdf(text, 'test.pdf')
  File "test_pdf.py", line 21, in txt_to_pdf
    raise e
  File "test_pdf.py", line 18, in txt_to_pdf
    pdf.output(CV_file, 'F')
  File "/usr/local/lib/python3.7/site-packages/fpdf/fpdf.py", line 1065, in output
    self.close()
  File "/usr/local/lib/python3.7/site-packages/fpdf/fpdf.py", line 246, in close
    self._enddoc()
  File "/usr/local/lib/python3.7/site-packages/fpdf/fpdf.py", line 1637, in _enddoc
    self._putresources()
  File "/usr/local/lib/python3.7/site-packages/fpdf/fpdf.py", line 1584, in _putresources
    self._putfonts()
  File "/usr/local/lib/python3.7/site-packages/fpdf/fpdf.py", line 1315, in _putfonts
    self._putTTfontwidths(font, ttf.maxUni)
  File "/usr/local/lib/python3.7/site-packages/fpdf/fpdf.py", line 1448, in _putTTfontwidths
    if (font['cw'][cid] == 0):
IndexError: list index out of range