No valid crumb when building more than one job

[Henrik Brunberg]

Started experiencing this issue after going from Jenkins 2.150.3 to 2.176.2.

This doesn't work:
import jenkins
j = jenkins.Jenkins('https://myjenkins', username='smth', password='smth')
j.build_job("job1") # success
j.build_job("job2") # fails with 'No valud crumb was included in the request for url...'

This works:
import jenkins
j = jenkins.Jenkins('https://myjenkins', username='smth', password='smth')
j.build_job("job1") # success
j2 = jenkins.Jenkins('https://myjenkins', username='smth',password='smth')
j2.build_job("job2") # success