Backslash keep-alive thread terminated after slash's TerminatedException

[ayalash]

...
slash.exceptions.TerminatedException: Terminated by signal

[2018-08-15 19:34:19.319511] ERROR:backslash.contrib.keepalive_thread: Quitting keepalive thread due to exception
Traceback (most recent call last):
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/backslash/contrib/keepalive_thread.py", line 24, in run
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/backslash/session.py", line 28, in send_keepalive
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/backslash/api.py", line 85, in call_function
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/requests/sessions.py", line 559, in post
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/requests/sessions.py", line 512, in request
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/raven/breadcrumbs.py", line 326, in send
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/requests/sessions.py", line 622, in send
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/requests/adapters.py", line 412, in send
  File "/home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/requests/adapters.py", line 227, in cert_verify
OSError: Could not find a suitable TLS CA certificate bundle, invalid path: /home/jenkins/jenkins/workspace/integ-qa/qa_bundle/env/lib/python3.6/site-packages/certifi/cacert.pem
[2018-08-15 19:34:19.323573] DEBUG:backslash.contrib.keepalive_thread: Backslash keepalive thread terminated

Backslash link: https://backslash.infinidat.com/#/sessions/ca1272b8-a095-11e8-a05d-005056976407_0/tests/ca1272b8-a095-11e8-a05d-005056976407_0_2

Log link: http://scotty.infinidat.com/#/beams/2964384?tag=ca1272b8-a095-11e8-a05d-005056976407_0

It reproduced more than once this week. Client version: 2.36.1.