java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.cloudbees.jenkins.plugins.customtools.CustomToolInstallWrapper$2.toEnvVars(CustomToolInstallWrapper.java:142)
at com.cloudbees.jenkins.plugins.customtools.CustomToolInstallWrapper$2.launch(CustomToolInstallWrapper.java:131)
at hudson.Launcher$ProcStarter.start(Launcher.java:338)
at org.jenkinsci.plugins.xvfb.XvfbBuildWrapper.decorateLauncher(XvfbBuildWrapper.java:191)
at hudson.model.AbstractBuild$AbstractBuildExecution.createLauncher(AbstractBuild.java:549)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:475)
at hudson.model.Run.execute(Run.java:1502)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:236)

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