Upload sometimes fails with FileExistsError

[tracek]

i could be the issue only exists in dev as result of very fast upload. Needs checking.

Traceback (most recent call last):
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 2328, in call
return self.wsgi_app(environ, start_response)
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 2314, in wsgi_app
response = self.handle_exception(e)
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 1760, in handle_exception
reraise(exc_type, exc_value, tb)
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/_compat.py", line 36, in reraise
raise value
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 2311, in wsgi_app
response = self.full_dispatch_request()
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 1834, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 1737, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/_compat.py", line 36, in reraise
raise value
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 1832, in full_dispatch_request
rv = self.dispatch_request()
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/flask/app.py", line 1818, in dispatch_request
return self.view_functionsrule.endpoint
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/site-packages/dash_upload_components/init.py", line 109, in resumable_post
_os.makedirs(temp_dir)
File "/home/tracek/anaconda3/envs/audioexplorer/lib/python3.6/os.py", line 220, in makedirs
mkdir(name, mode)
FileExistsError: [Errno 17] File exists: '/tmp/18140634-STHELENA-02_20140605_200000_10wav'