Error while accessing graph from browser

[ParvinderParashar]

Traceback (most recent call last):
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/local/lib/python3.7/site-packages/flask/_compat.py", line 35, in reraise
raise value
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/local/lib/python3.7/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functionsrule.endpoint
File "/usr/local/lib/python3.7/site-packages/dash/dash.py", line 1151, in dispatch
response.set_data(self.callback_map[output]'callback')
File "/usr/local/lib/python3.7/site-packages/dash/dash.py", line 1037, in add_context
output_value = func(*args, **kwargs)
File "/graphql-bench/plot.py", line 93, in updateGraph
benchMarkIndex=int(benchMarkIndex)
TypeError: int() argument must be a string, a bytes-like object or a number, not 'NoneType'

[ParvinderParashar]

[logs1.txt](https://github.com/hasura/graphql-bench/files/3106751/logs1.txt)

[ParvinderParashar]

logs1.txt