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

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java.lang.NullPointerException:
at bndtools.central.Central.stop(Central.java:119)
at bndtools.Plugin.stopStartupParticipants(Plugin.java:141)
at bndtools.Plugin.stop(Plugin.java:155)
at org.eclipse.osgi.internal.framework.BundleContextImpl$4.run(BundleContextImpl.java:830)
at org.eclipse.osgi.internal.framework.BundleContextImpl.stop(BundleContextImpl.java:823)
at org.eclipse.osgi.internal.framework.EquinoxBundle.stopWorker0(EquinoxBundle.java:946)
at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.stopWorker(EquinoxBundle.java:314)
at org.eclipse.osgi.container.Module.doStop(Module.java:636)
at org.eclipse.osgi.container.Module.stop(Module.java:498)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.decStartLevel(ModuleContainer.java:1661)
at org.eclipse.osgi.container.ModuleContainer$ContainerStartLevel.doContainerStartLevel(ModuleContainer.java:1580)
at org.eclipse.osgi.container.SystemModule.stopWorker(SystemModule.java:253)
at org.eclipse.osgi.internal.framework.EquinoxBundle$SystemBundle$EquinoxSystemModule.stopWorker(EquinoxBundle.java:147)
at org.eclipse.osgi.container.Module.doStop(Module.java:636)
at org.eclipse.osgi.container.Module.stop(Module.java:498)
at org.eclipse.osgi.container.SystemModule.stop(SystemModule.java:191)
at java.lang.Thread.run(Thread.java:745)

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