AttributeError: 'list' object has no attribute 'split'

[galaxyproject-sentryintegration]

Sentry Issue: GALAXY-MAIN-1182

AttributeError: 'list' object has no attribute 'split'
(2 additional frame(s) were not displayed)
...
  File "galaxy/web/framework/middleware/error.py", line 167, in __call__
    app_iter = self.application(environ, sr_checker)
  File "galaxy/web/framework/middleware/statsd.py", line 29, in __call__
    req = self.application(environ, start_response)
  File "galaxy/web/framework/base.py", line 176, in __call__
    return self.handle_request(request_id, path_info, environ, start_response)
  File "galaxy/web/framework/base.py", line 271, in handle_request
    body = method(trans, **kwargs)
  File "galaxy/webapps/galaxy/controllers/user.py", line 288, in activate
    email = unquote(email)

Uncaught Exception