Disabling security fails with AttributeError

Stack Advisor reported an error: AttributeError: 'NoneType' object has no attribute 'replace'
StdOut file: /var/run/ambari-server/stack-recommendations/26/stackadvisor.out

StdErr file: /var/run/ambari-server/stack-recommendations/26/stackadvisor.err

Traceback (most recent call last):
  File "/var/lib/ambari-server/resources/scripts/stack_advisor.py", line 166, in <module>
    main(sys.argv)
  File "/var/lib/ambari-server/resources/scripts/stack_advisor.py", line 116, in main
    result = stackAdvisor.recommendConfigurations(services, hosts)
  File "/var/lib/ambari-server/resources/scripts/../stacks/stack_advisor.py", line 775, in recommendConfigurations
    calculation(configurations, clusterSummary, services, hosts)
  File "/var/lib/ambari-server/resources/scripts/./../stacks/HDP/2.5/services/stack_advisor.py", line 480, in recommendStormConfigurations
    storm_nimbus_impersonation_acl.replace('{{storm_bare_jaas_principal}}', storm_bare_jaas_principal)
AttributeError: 'NoneType' object has no attribute 'replace'