/edit/css error with long image upload names

[globalistas]

When user enters a name over 10 chars in lenght, the following comes up:

KeyError: 'subInfo'

Traceback (most recent call last)
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 2450, in wsgi_app
response = self.handle_exception(e)
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 1867, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/toxu/.local/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/toxu/.local/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
raise value
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "/home/toxu/.local/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/toxu/.local/lib/python3.8/site-packages/flask_login/utils.py", line 272, in decorated_view
return func(*args, **kwargs)
File "/home/toxu/throat/app/views/do.py", line 2007, in sub_upload
return engine.get_template('sub/css.html').render({'sub': sub, 'form': form, 'storage': int(remaining - (1024 * 1024)),
File "/home/toxu/.local/lib/python3.8/site-packages/wheezy/template/engine.py", line 134, in render
return self.render_template(ctx, {}, {})
File "sub/css.html", line 2, in render

KeyError: 'subInfo'```