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

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java.lang.NullPointerException:
at hudson.plugins.sauce_ondemand.SauceEnvironmentUtil.outputWebDriverVariables(SauceEnvironmentUtil.java:46)
at hudson.plugins.sauce_ondemand.SauceOnDemandBuildWrapper$1.buildEnvVars(SauceOnDemandBuildWrapper.java:168)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:922)
at hudson.tasks.Ant.perform(Ant.java:144)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:784)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:565)
at hudson.model.Run.execute(Run.java:1670)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:231)

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