I have experienced the same problem on jenkins 2.150.2 with Artifactory Plugin 3.1.0, freshly installed from scratch, no pre-existing jobs or configuration. Problem occurs when viewing job config history plugin page on a new job without any builds, but with only one config version. However, job config history plugin is not seen in the stack trace. Copying the global artifactory configuration from a working jenkins instance did not change the problem. The exception does not occur if I run this tiny groovy script:
(new org.jfrog.hudson.action.ArtifactoryProjectAction("foo", "bar")).getUrlName()
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