ebook convert successfully in GUI but failed in command line

[Tshu Wang]

if I convert azw3 or mobi books in terminal to zip, I always got the following error. However everything work fine if I convert book in GUI. I wander if there is any option should set in command line convertation or any other tips. thx

BTW, attachment is a sample book.

System: macOS Mojave 10.14.3
Calibre: 3.38.1
ebook-convert (calibre 3.38.1)
Created by: Kovid Goyal <email address hidden>

Error:
Python function terminated unexpectedly: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters
Traceback (most recent call last):
  File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 154, in main
    return run_entry_point()
  File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 114, in run_entry_point
    return getattr(pmod, func)()
  File "site-packages/calibre/ebooks/conversion/cli.py", line 391, in main
  File "site-packages/calibre/ebooks/conversion/plumber.py", line 1270, in run
  File "site-packages/calibre/ebooks/conversion/plugins/html_output.py", line 123, in convert
  File "site-packages/calibre/ebooks/conversion/plugins/html_output.py", line 75, in generate_html_toc
  File "site-packages/calibre/ebooks/conversion/plugins/html_output.py", line 69, in generate_toc
  File "site-packages/calibre/ebooks/conversion/plugins/html_output.py", line 61, in build_node
  File "site-packages/calibre/ebooks/oeb/base.py", line 318, in element
  File "src/lxml/lxml.etree.pyx", line 3127, in lxml.etree.SubElement (src/lxml/lxml.etree.c:78512)
  File "src/lxml/apihelpers.pxi", line 203, in lxml.etree._makeSubElement (src/lxml/lxml.etree.c:18851)
  File "src/lxml/apihelpers.pxi", line 198, in lxml.etree._makeSubElement (src/lxml/lxml.etree.c:18777)
  File "src/lxml/apihelpers.pxi", line 302, in lxml.etree._initNodeAttributes (src/lxml/lxml.etree.c:20259)
  File "src/lxml/apihelpers.pxi", line 316, in lxml.etree._addAttributeToNode (src/lxml/lxml.etree.c:20597)
  File "src/lxml/apihelpers.pxi", line 1443, in lxml.etree._utf8 (src/lxml/lxml.etree.c:31876)
ValueError: All strings must be XML compatible: Unicode or ASCII, no NULL bytes or control characters

[Kovid Goyal (kovid)]

Fixed in branch master. The fix will be in the next release. calibre is usually released every alternate Friday.

 status fixreleased