When I enable NUGet Trigger on my job and save, I get an error from the stapler, caused by a NullPointerException in NugetTrigger.getLogFile(NugetTrigger.java:36). That's where it's trying to build a File for the polling log base doff the job's root directory. Full stack trace attached.
I found some similar but older bug reports against other plugins, e.g.: https://issues.jenkins-ci.org/browse/JENKINS-18667?focusedCommentId=181728&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-181728