The script cannot handle table DOM

[giraffeAlpaca]

https://warsier.gitbooks.io/new_master_rule/content/3/32/322/3222.html
Traceback (most recent call last): File "gitbook.py", line 309, in <module> Gitbook2PDF(url).run() File "gitbook.py", line 195, in run loop.run_until_complete(self.crawl_main_content(content_urls)) File "/home/ilab/.conda/envs/gitbook/lib/python3.7/asyncio/base_events.py", line 587, in run_until_complete return future.result() File "gitbook.py", line 217, in crawl_main_content await asyncio.gather(*tasks) File "gitbook.py", line 238, in gettext text = ChapterParser(metatext, title, level, ).parser() File "gitbook.py", line 102, in parser return html.unescape(ET.tostring(context).decode()) File "src/lxml/etree.pyx", line 3351, in lxml.etree.tostring File "src/lxml/serializer.pxi", line 139, in lxml.etree._tostring File "src/lxml/serializer.pxi", line 199, in lxml.etree._raiseSerialisationError lxml.etree.SerialisationError: IO_ENCODER

The script seems to go wrong when the page contains a table.