Frontend goes into infinite loop

[meling]

When not logged in, clicking New Course, then Users from the Admin Menu, the frontend generates requests to the server that are unauthorized in an infinite loop. Here is an excerpt from the server's log:

INFO[0005] Handled request                               host=meling.itest.run method=GET path=/ remote_ip=92.220.248.44 status=200 time_rfc3339="2017-08-02T21:38:09+02:00" uri=/ user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"
INFO[0005] Handled request                               host=meling.itest.run method=GET path=/dist/bundle.js remote_ip=92.220.248.44 status=200 time_rfc3339="2017-08-02T21:38:09+02:00" uri=/dist/bundle.js user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"
ERRO[0006] code=401, message=Unauthorized
INFO[0006] Handled request                               host=meling.itest.run method=GET path=/api/v1/user remote_ip=92.220.248.44 status=401 time_rfc3339="2017-08-02T21:38:09+02:00" uri=/api/v1/user user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"
ERRO[0018] code=401, message=Unauthorized
INFO[0018] Handled request                               host=meling.itest.run method=GET path=/api/v1/providers remote_ip=92.220.248.44 status=401 time_rfc3339="2017-08-02T21:38:21+02:00" uri=/api/v1/providers user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"
ERRO[0021] code=401, message=Unauthorized
INFO[0021] Handled request                               host=meling.itest.run method=GET path=/api/v1/providers remote_ip=92.220.248.44 status=401 time_rfc3339="2017-08-02T21:38:25+02:00" uri=/api/v1/providers user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"
ERRO[0022] code=401, message=Unauthorized
INFO[0022] Handled request                               host=meling.itest.run method=GET path=/api/v1/users remote_ip=92.220.248.44 status=401 time_rfc3339="2017-08-02T21:38:26+02:00" uri=/api/v1/users user_agent="Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36"
ERRO[0022] code=401, message=Unauthorized