Jobs which are not configured with Naginator are also failed because of the below error.

FATAL: null
java.lang.NullPointerException
at com.chikli.hudson.plugin.naginator.NaginatorListener.setUpEnvironment(NaginatorListener.java:94)
at hudson.model.AbstractBuild$AbstractBuildExecution.createLauncher(AbstractBuild.java:587)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:491)
at hudson.model.Run.execute(Run.java:1759)
at hudson.maven.MavenBuild.run(MavenBuild.java:269)
at hudson.model.ResourceController.execute(ResourceController.java:89)
at hudson.model.Executor.run(Executor.java:240)

Also Choice Parameter is not working after installing Naginator plugin.