searching 'ticket:1,2' shows a blank page with UnicodeDecodeError

[matobaa <matobaa+trac-hacks@…>]

click search on mainnav, input ticket:1,2 in a textbox then click 'search' shows a blank page with log follows:

  File "c:\trac\1.4\.venv\lib\site-packages\trac\templates\theme.html", line 128, in block "body"
    # block content
  File "c:\trac\1.4\.venv\lib\site-packages\trac\search\templates\search.html", line 79, in block "content"
    _('Quickjump to %(name)s', name=quickjump.name)|safe}</a>
  File "c:\trac\1.4\.venv\lib\site-packages\jinja2\filters.py", line 887, in do_mark_safe
    return Markup(value)
  File "c:\trac\1.4\.venv\lib\site-packages\markupsafe\__init__.py", line 74, in __new__
    return text_type.__new__(cls, base)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 26: ordinal not in range(128)

System Information
User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.132 Safari/537.36

Package	Version
Trac	1.4
Genshi	(not installed, some old plugins may not work as expected)
Jinja2	2.10.1
pysqlite	2.6.0
Python	2.7.16 (v2.7.16:413a49145e, Mar 4 2019, 01:37:19) [MSC v.1500 64 bit (AMD64)]
setuptools	41.2.0
SQLite	3.14.2
jQuery	1.12.4
jQuery UI	1.12.1
jQuery Timepicker	1.6.3


Configuration

database	sqlite:db/trac.db