Problem with UTF-8 encoded characters

[nonprofittechy]

Error
UnicodeEncodeError: 'utf-8' codec can't encode character '\ud860' in position 4410: surrogates not allowed
Log
Traceback (most recent call last):
File "/usr/share/docassemble/local3.6/lib/python3.6/site-packages/flask/app.py", line 1949, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/share/docassemble/local3.6/lib/python3.6/site-packages/flask/app.py", line 1935, in dispatch_request
return self.view_functionsrule.endpoint
File "/usr/share/docassemble/local3.6/lib/python3.6/site-packages/docassemble/webapp/server.py", line 9935, in index
response = make_response(output.encode('utf-8'), '200 OK')
UnicodeEncodeError: 'utf-8' codec can't encode character '\ud860' in position 4410: surrogates not allowed