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

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java.lang.NullPointerException:
at it.baeyens.arduino.tools.Helpers.setTheEnvironmentVariables(Helpers.java:872)
at it.baeyens.arduino.listeners.ConfigurationChangeListener.handleEvent(ConfigurationChangeListener.java:47)
at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.notifyListeners(CProjectDescriptionManager.java:2212)
at org.eclipse.cdt.internal.core.settings.model.AbstractCProjectDescriptionStorage.fireAboutToApplyEvent(AbstractCProjectDescriptionStorage.java:284)
at org.eclipse.cdt.internal.core.settings.model.SetCProjectDescriptionOperation.executeOperation(SetCProjectDescriptionOperation.java:66)
at org.eclipse.cdt.internal.core.model.CModelOperation.execute(CModelOperation.java:341)
at org.eclipse.cdt.internal.core.model.CModelOperation.run(CModelOperation.java:607)
at org.eclipse.cdt.internal.core.model.CModelOperation.runOperation(CModelOperation.java:638)
at org.eclipse.cdt.internal.core.settings.model.AbstractCProjectDescriptionStorage.setProjectDescription(AbstractCProjectDescriptionStorage.java:203)
at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionStorageManager.setProjectDescription(CProjectDescriptionStorageManager.java:149)
at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.setProjectDescription(CProjectDescriptionManager.java:885)
at org.eclipse.cdt.managedbuilder.internal.core.BuildSettingsUtil.checkApplyDescription(BuildSettingsUtil.java:211)
at org.eclipse.cdt.managedbuilder.core.ManagedBuildManager.updateCoreSettings(ManagedBuildManager.java:1574)
at org.eclipse.cdt.build.internal.core.scannerconfig.CfgDiscoveredPathManager$1.run(CfgDiscoveredPathManager.java:154)
at org.eclipse.cdt.internal.core.model.BatchOperation.executeOperation(BatchOperation.java:36)
at org.eclipse.cdt.internal.core.model.CModelOperation.execute(CModelOperation.java:341)
at org.eclipse.cdt.internal.core.model.CModelOperation.run(CModelOperation.java:607)
at org.eclipse.cdt.core.model.CoreModel.run(CoreModel.java:1220)
at org.eclipse.cdt.core.model.CoreModel.run(CoreModel.java:1181)
at org.eclipse.cdt.build.internal.core.scannerconfig.CfgDiscoveredPathManager.updateCoreSettings(CfgDiscoveredPathManager.java:157)
at org.eclipse.cdt.build.core.scannerconfig.ScannerConfigBuilder.build(ScannerConfigBuilder.java:125)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:205)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:245)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:303)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:262)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:402)
at org.eclipse.core.internal.resources.Project$1.run(Project.java:556)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2241)
at org.eclipse.core.internal.resources.Project.internalBuild(Project.java:534)
at it.baeyens.arduino.actions.BuildJobHandler.run(BuildHandler.java:45)

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