TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'list'

[bhamdans]

[2021-03-21 18:52:51,305] ERROR in app: Exception on / [POST]
Traceback (most recent call last):
File "/home/smartd/virt/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/home/smartd/virt/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/smartd/virt/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/smartd/virt/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/home/smartd/virt/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/home/smartd/virt/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functionsrule.endpoint
File "server.py", line 145, in index
delay = (org_time - next_time).seconds
TypeError: unsupported operand type(s) for -: 'datetime.datetime' and 'list'
127.0.0.1 - - [21/Mar/2021 18:52:51] "POST / HTTP/1.1" 500 -

Seems to have a code issue.