not enough values to unpack

[dmalan]

Traceback (most recent call last):
  File "/usr/local/bin/render50", line 531, in <module>
    main()
  File "/usr/local/bin/render50", line 275, in main
    write(output, documents)
  File "/usr/local/bin/render50", line 506, in write
    documents[0].copy(pages).write_pdf(output)
  File "/usr/local/lib/python3.7/site-packages/weasyprint/document.py", line 645, in write_pdf
    bookmarks = self.make_bookmark_tree()
  File "/usr/local/lib/python3.7/site-packages/weasyprint/document.py", line 499, in make_bookmark_tree
    for level, label, (point_x, point_y), state in page.bookmarks:
ValueError: not enough values to unpack (expected 4, got 3)

Kozea/WeasyPrint#902