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

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at com.cloudbees.jenkins.plugins.customtools.CustomToolInstallWrapper$2.toEnvVars(
at com.cloudbees.jenkins.plugins.customtools.CustomToolInstallWrapper$2.launch(
at hudson.Launcher$ProcStarter.start(
at org.jenkinsci.plugins.xvfb.XvfbBuildWrapper.decorateLauncher(
at hudson.model.AbstractBuild$AbstractBuildExecution.createLauncher(
at hudson.model.AbstractBuild$
at hudson.model.Run.execute(
at hudson.model.ResourceController.execute(

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